The usual way of finding the LFC is to lift a parcel from a lower level along the dry adiabatic lapse rate until it crosses the saturated mixing ratio line of the parcel: this is the lifted condensation level (LCL).
The typical method to determine the LFC involves lifting a parcel from a lower altitude along the dry adiabatic lapse rate until it intersects the saturated mixing ratio line of the parcel: this is the lifted condensation level (LCL).