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

### Instruction:
When is it that successor's formal installation has a Vacator of ross bass (d)?

### Inputs:
table_name: table, columns: ['State (class)', 'Vacator', 'Reason for change', 'Successor', "Date of successor's formal installation"]

### Response:
SELECT Date of successor's formal installation FROM table WHERE Vacator = ross bass (d)