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

### Instruction:
What is the highest score in round 4 and total of 284 in a year more recent than 1998?

### Inputs:
table_name: table, columns: ['Year', 'Tournament', 'Round 1', 'Round 2', 'Round 3', 'Round 4', 'Score', 'To par', 'Place', 'Money (￥)']

### Response:
SELECT MAX Round 4 FROM table WHERE Score = 284 AND Year > 1998