For each of the numbering systems below, can you determine the rule for representing numbers in that system?

| Decimal    | Number System 1 | Number System 2 | Number System 3 |
|------------|:---------------:|:---------------:|:---------------:|
| 25         | 9               | 231             | 200             |
| 392        | $,              | 6040            | 2003            |
| 5,236      | W+              | 83440           | 1011002         |
| 146,004    | 00t             | 1380300         | 300000012       |
| 25,897,872 | >3V1            | C6345030        | 123014          |