Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What's the average of shows that had a timeslot rank greater that 3 but still had a smaller viewership less than 4.87?

### Inputs:
table_name: table, columns: ['Episode', 'Air Date', 'Timeslot', 'Rating', 'Share', '18-49 (Rating/Share)', 'Viewers (m)', 'Rank (Timeslot)', 'Rank (Night)', 'Rank (Overall)']

### Response:
SELECT AVG Share FROM table WHERE Rank (Timeslot) > 3 AND Viewers (m) < 4.87