CREATE TABLE table_64436 ("Fuel gas" TEXT, "Upper index Kcal/ Nm 3" FLOAT, "Lower index Kcal/ Nm 3" FLOAT, "Upper index MJ/ Nm 3" FLOAT, "Lower index MJ/ Nm 3" FLOAT)

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