Table schema:
CREATE TABLE table_name_78 (total_population__2005_estimate_ INTEGER, province VARCHAR, area__km_2__ VARCHAR)

Question: Which Total population (2005 estimate) has a Province of west kalimantan (kalimantan barat), and an Area (km 2) smaller than 147,307.00?
SQL: SELECT AVG(total_population__2005_estimate_) FROM table_name_78 WHERE province = "west kalimantan (kalimantan barat)" AND area__km_2__ < 147 OFFSET 307.00