Probit model -how to use

I am trying to understand how to interpret the result of Zmijewski bankruptcy prediction model based on probit model. Wanda A. Wallace wrote in this document (page 8) that it is necessary to multiply each parameter by 1.8138 and then use one more step to get the right result.

I am wondering why I need to do these steps.. I can't find the answer anywhere so I hope someone could advice me something helpful..