Finding the Fourth Proportional to 636,271.72, 878,073.15 and 387,928.00

Step by Step Solution

1. Step 1: Write the proportion equation
   636,271.72 : 878,073.15 = 387,928.00 : x
2. Step 2: Convert to fraction form
   636,271.72/878,073.15 = 387,928.00/x
3. Step 3: Cross multiply
   636,271.72x = 878,073.15 × 387,928.00
4. Step 4: Simplify right side
   636,271.72x = 340,629,160,091.15
5. Step 5: Solve for x
   x = 340,629,160,091.15/636,271.72
6. Step 6: Final answer
   x = 535,351.72