Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_64432 ( "Fuel gas" text, "Upper index Kcal/ Nm 3" real, "Lower index Kcal/ Nm 3" real, "Upper index MJ/ Nm 3" real, "Lower index MJ/ Nm 3" real )

### Question ###
What is the average upper index MJ/Nm 3 for the upper index Kcal/Nm 3 entry of 19,376?

### Accurate SQL ###

SELECT AVG("Upper index MJ/ Nm 3") FROM table_64432 WHERE "Upper index Kcal/ Nm 3" = '19,376'