7230 * 306 : 540 - (84256 + 278152) : 712

1. 7230 * 306 = 2212380
2. 2212380 / 540 = 4100.7037...
3. 84256 + 278152 = 362408
4. 362408 / 712 = 510.4045...
5. 4100.7037 - 510.4045 = 3590.2992...