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?
SQL: SELECT SUM(upper_index_kcal__nm_3) FROM table_name_1 WHERE lower_index_mj__nm_3 > 47.91 AND fuel_gas = "propylene" AND upper_index_mj__nm_3 > 77.04