Is it possible to calculate share price previous to stock split based on adjusted close price?

In a traditional stock split, the number of shares increases by the split ratio and share price decreases by the inverse of that ratio.

For example, you own 100 shares of XYZ at $100 and a 2:1 split occurs. The post split position will be 200 shares at $50. The value of the position is unchanged since 100 x $100 = 200 x $50.

To reverse engineer the data, apply the inverse of the split numbers. If historical data shows that the close was $50 the day before a 2:1 split, then the actual close was $100.