In the Data Ribbon Tab in the Forecast Ribbon Group, you clicked the What-if Analysis button. In the What-if Analysis menu, you clicked the Goal Seek... menu item. Inside the Goal Seek dialog, you typed 550,000 in the To value: input, typed C2 in the By changing cell: input, and clicked the OK button. Inside the Goal Seek Status dialog, you clicked the OK button. Explanation: Goal seek is a function in Excel that allows you to find the value of a cell that will result in a desired value for another cell. In this case, you would use goal seek to find the value for cell C@ that will result in a value of $550,000 for cell B15. To do this, you would select the cell that you want to find the value for (C@), enter the desired value for the other cell (B15), and then click the Goal Seek button. Excel will then calculate the value for C@ that will result in a value of $550,000 for B15.