| 1000 | = | 364 5 | ÷ | ( | 1 | + | r | ) | + | 392 5 | ÷ | ( | 1 | + | r | ) | × | 2 | + | 406 5 | ÷ | ( | 1 | + | r | ) | × | 3 | + | 5671 5 | ÷ | ( | 1 | + | r | ) | × | 4 |
| 方程两边同时乘以: | ( | 1 | + | r | ) |
| 1000 | ( | 1 | + | r | ) | = | 364 5 | + | 392 5 | × | 2 | + | 406 5 | × | 3 | + | 5671 5 | × | 4 |
| 1000 | × | 1 | + | 1000 | r | = | 364 5 | + | 392 5 | × | 2 | + | 406 5 | × | 3 | + | 5671 5 | × | 4 |
| 1000 | + | 1000 | r | = | 364 5 | + | 784 5 | + | 1218 5 | + | 22684 5 |
| 1000 | + | 1000 | r | = | 5010 |
| 1000 | r | = | 5010 | − | 1000 |
| 1000 | r | = | 4010 |
| r | = | 4010 | ÷ | 1000 |
| = | 4010 | × | 1 1000 |
| = | 401 | × | 1 100 |
| r | = | 401 100 |
| r | = | 4.01 |