| 10000 | = | ( | X | × | 40 100 | × | 60 | × | 12 | ) | + | ( | X | × | 30 | × | 12 | ) |
| 方程右边 = | X | × | 40 100 | × | 60 | × | 12 | + | ( | X | × | 30 | × | 12 | ) |
| = | X | × | 288 | + | ( | X | × | 30 | × | 12 | ) |
| = | 288 | X | + | X | × | 30 | × | 12 |
| = | 288 | X | + | X | × | 360 |
| = | 648 | X |
| 10000 | = | 648 | X |
| - | 648 | X | = | - | 10000 |
| 10000 | = | 648 | X |
| 648 | X | = | 10000 |
| X | = | 10000 | ÷ | 648 |
| = | 10000 | × | 1 648 |
| = | 1250 | × | 1 81 |
| X | = | 1250 81 |
| X | = | 15.432099 |