| 1000 | i | × | 1543 500 | + | 119723 100 | × | 408 625 | = | 1000 |
| 方程左边 = | 3086 | i | + | 12211746 15625 |
| 3086 | i | + | 12211746 15625 | = | 1000 |
| 3086 | i | = | 1000 | − | 12211746 15625 |
| 3086 | i | = | 3413254 15625 |
| i | = | 3413254 15625 | ÷ | 3086 |
| = | 3413254 15625 | × | 1 3086 |
| = | 1706627 15625 | × | 1 1543 |
| i | = | 1706627 24109375 |
| i | = | 0.070787 |