| ( | 15140 | + | 200 | + | X | ) | × | 11 500 | = | 4 | X |
| Left side of the equation = | 15140 | × | 11 500 | + | 200 | × | 11 500 | + | X | × | 11 500 |
| = | 8327 25 | + | 22 5 | + | X | × | 11 500 |
| = | 8437 25 | + | 11 500 | X |
8437 25 | + | 11 500 | X | = | 4 | X |
11 500 | X | − | 4 | X | = | - | 8437 25 |
| - | 1989 500 | X | = | - | 8437 25 |
8437 25 | = | 1989 500 | X |
1989 500 | X | = | 8437 25 |
| X | = | 8437 25 | ÷ | 1989 500 |
| = | 8437 25 | × | 500 1989 |
| = | 649 | × | 20 153 |
| X | = | 12980 153 |
| X | = | 84.836601 |