EasyFit provides the integrated StatAssist tool (available from the Tools menu) allowing you to make estimates/projections for all the commonly used distributions. If you have already fitted some distributions to your data, you can highlight and right-click one of the fitted models, and select StatAssist:

In StatAssist, open the Calculations tab, and specify the probability value. StatAssist will automatically calculate the Inverse CDF value indicating an estimate or a future projection:

Conclusion

The probabilistic estimates and projections can be performed using the Inverse CDF of the distribution that best fits to your historical data. Depending on the distribution, the Inverse CDF can be either derived from the CDF, or evaluated using numerical methods or approximation formulas. EasyFit allows to easily evaluate the Inverse CDF for more than 30 popular distributions, enabling you to apply the probabilistic model to obtain useful information about the random process you are dealing with.