There is no straight forward solution that I could figure out. You can try either of the suggestions below :
- Loop through rows and columns of data table and convert them using the same logic that I had posted earlier : (This is for one column, follow the same for all the columns in your Datatable)
- Open Excel application on using excel activities, select the range and perform formatting actions on the excel application with click / type into / send hotkeys activities. Once the excel sheet is formatted into decimals as needed, you can use Read Range activity again to read all the content into data table.
Here is a thread that you might find useful for this option