Find the next number in the pattern.

0.5, 2.3, 12.5, 62.5

The pattern is as follows:

0.5 * 4 + 1 = 3
2.3 * 5 + 2 = 13
12.5 * 6 + 3 = 78
62.5 * 7 + 4 = 439

Therefore, the next number in the pattern is 439.