<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def findTransformation(self, inSR, outSR, extentOfInterest=None, numOfResults=1):
 """ The findTransformations operation is performed on a geometry service resource. This operation returns a list of applicable geographic transformations you should use when projecting geometries from the input spatial reference to the output spatial reference. The transformations are in JSON format and are returned in order of most applicable to least applicable. Recall that a geographic transformation is not needed when the input and output spatial references have the same underlying geographic coordinate systems. In this case, findTransformations returns an empty list. Every returned geographic transformation is a forward transformation meaning that it can be used as-is to project from the input spatial reference to the output spatial reference. In the case where a predefined transformation needs to be applied in the reverse direction, it is returned as a forward composite transformation containing one transformation and a transformForward element with a value of false. Inputs: inSR - The well-known ID (WKID) of the spatial reference or a spatial reference JSON object for the input geometries outSR - The well-known ID (WKID) of the spatial reference or a spatial reference JSON object for the input geometries extentOfInterest - The bounding box of the area of interest specified as a JSON envelope. If provided, the extent of interest is used to return the most applicable geographic transformations for the area. If a spatial reference is not included in the JSON envelope, the inSR is used for the envelope. numOfResults - The number of geographic transformations to return. The default value is 1. If numOfResults has a value of -1, all applicable transformations are returned. """

        params = {
            "f" : "json",
            "inSR" : inSR,
            "outSR" : outSR
        }
        url = self._url + "/findTransformations"
        if isinstance(numOfResults, int):
            params['numOfResults'] = numOfResults
        if isinstance(extentOfInterest, Envelope):
            params['extentOfInterest'] = extentOfInterest.asDictionary
        return self._post(url=url, param_dict=params,
                             securityHandler=self._securityHandler,
                             proxy_url=self._proxy_url,
                             proxy_port=self._proxy_port)