Table schema:
CREATE TABLE table_name_29 (share INTEGER, viewers__m_ VARCHAR, timeslot VARCHAR)

Question: What's the average of shows that had a timeslot rank greater that 3 but still had a smaller viewership less than 4.87?
SQL: SELECT AVG(share) FROM table_name_29 WHERE RANK(timeslot) > 3 AND viewers__m_ < 4.87