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_64436 ( "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 entry for Upper index Kcal/ Nm 3 for the row with an entry that has a Lower index MJ/ Nm 3 larger than 47.91, for propylene, and an Upper index MJ/ Nm 3 larger than 77.04?

### Accurate SQL ###

SELECT SUM("Upper index Kcal/ Nm 3") FROM table_64436 WHERE "Lower index MJ/ Nm 3" > '47.91' AND "Fuel gas" = 'propylene' AND "Upper index MJ/ Nm 3" > '77.04'