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

### Instruction:
Who was the successor that was formally installed on March 30, 1870?

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

### Response:
SELECT Successor FROM table WHERE Date of successors formal installation = March 30, 1870