user: 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?
Columns: ['Fuel gas', 'Upper index Kcal/ Nm 3', 'Lower index Kcal/ Nm 3', 'Upper index MJ/ Nm 3', 'Lower index MJ/ Nm 3']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['Hydrogen', 11528.0, 9715.0, 48.23, 40.65]
SQL:

assistant: SELECT "Upper index Kcal/ Nm 3" FROM "Table" WHERE "Lower index MJ/ Nm 3" > 47.91 AND "Fuel gas" = 'Propylene' AND "Upper index MJ/ Nm 3" > 77.04;