| ( | 10420 | + | 20 | + | X | ) | × | 37 1000 | = | 4 | X |
| 方程左边 = | 10420 | × | 37 1000 | + | 20 | × | 37 1000 | + | X | × | 37 1000 |
| = | 19277 50 | + | 37 50 | + | X | × | 37 1000 |
| = | 9657 25 | + | 37 1000 | X |
9657 25 | + | 37 1000 | X | = | 4 | X |
37 1000 | X | − | 4 | X | = | - | 9657 25 |
| - | 3963 1000 | X | = | - | 9657 25 |
9657 25 | = | 3963 1000 | X |
3963 1000 | X | = | 9657 25 |
| X | = | 9657 25 | ÷ | 3963 1000 |
| = | 9657 25 | × | 1000 3963 |
| = | 3219 | × | 40 1321 |
| X | = | 128760 1321 |
| X | = | 97.471612 |