What is the Lower index Kcal/ Nm 3 entry, for the row with entries of an Upper index Kcal/ Nm 3 smaller than 19,376, and a Lower index MJ/ Nm 3 of 74.54?
CREATE TABLE "wobbe_index_of_common_fuel_gases" (
  "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
);
SELECT AVG("lower_index_kcal_nm_3") FROM "wobbe_index_of_common_fuel_gases" WHERE "lower_index_mj_nm_3"=74.54 AND "upper_index_kcal_nm_3"<'19,376';