This is easily done with Excel by highlighting the cell in which the calculation is going to be made. This is below the heading ER proxy. The click on the equal sign in the formula bar on the top of the spreadsheet. This prepares the cell for a formula. Next click on the appropriate expected return cell, then hit the divide sign on the keyboard, and finally click on the respective price.
Press enter and the calculation is over.
Another great thing about Excel is the fact formulas can be easily transferred. Instead of doing the same thing for the rest of the companies, one can copy the formula down a column of cells. Click and hold the bottom right corner of the cell with the formula. Then drag it down to as many cells needing the formula. This will automatically copy the formula in those cells.