Table schema:
CREATE TABLE table_name_42 (rank INTEGER, location VARCHAR, current_seating_capacity VARCHAR)

Question: What is Lowest Rank, when Location is Rio De Janeiro, Brazil, and when Current Seating Capacity is less than 78,838?
SQL: SELECT MIN(rank) FROM table_name_42 WHERE location = "rio de janeiro, brazil" AND current_seating_capacity < 78 OFFSET 838