13 100 | ÷ | x | = | 1289 10000 | ÷ | 86289 100000 |
| Multiply both sides of the equation by: | x |
13 100 | = | 1289 10000 | ÷ | 86289 100000 | × | x |
1289 10000 | ÷ | 86289 100000 | × | x | = | 13 100 |
12890 86289 | x | = | 13 100 |
| x | = | 13 100 | ÷ | 12890 86289 |
| = | 13 100 | × | 86289 12890 |
| x | = | 1121757 1289000 |
| x | = | 0.870254 |