Finding the Fourth Proportional to 200,020.85, 275,898.71 and 128,287.25

Step by Step Solution

1. Step 1: Write the proportion equation
   200,020.85 : 275,898.71 = 128,287.25 : x
2. Step 2: Convert to fraction form
   200,020.85/275,898.71 = 128,287.25/x
3. Step 3: Cross multiply
   200,020.85x = 275,898.71 × 128,287.25
4. Step 4: Simplify right side
   200,020.85x = 35,394,284,763.52
5. Step 5: Solve for x
   x = 35,394,284,763.52/200,020.85
6. Step 6: Final answer
   x = 176,952.98