| ( | 1 | − | 5200 | ÷ | X | ) | × | 100 | = | 19 200 |
| 1 | × | 100 | − | 5200 | ÷ | X | × | 100 | = | 19 200 |
| 100 | − | 520000 | ÷ | X | = | 19 200 |
| Multiply both sides of the equation by: | X |
| 100 | X | − | 520000 | = | 19 200 | X |
| 100 | X | − | 19 200 | X | = | 520000 |
19981 200 | X | = | 520000 |
| X | = | 520000 | ÷ | 19981 200 |
| = | 520000 | × | 200 19981 |
| = | 40000 | × | 200 1537 |
| X | = | 8000000 1537 |
| X | = | 5204.944697 |