Finding the Fourth Proportional to 518,498.52, 715,528.20 and 280,034.52

Step by Step Solution

1. Step 1: Write the proportion equation
   518,498.52 : 715,528.20 = 280,034.52 : x
2. Step 2: Convert to fraction form
   518,498.52/715,528.20 = 280,034.52/x
3. Step 3: Cross multiply
   518,498.52x = 715,528.20 × 280,034.52
4. Step 4: Simplify right side
   518,498.52x = 200,372,596,033.46
5. Step 5: Solve for x
   x = 200,372,596,033.46/518,498.52
6. Step 6: Final answer
   x = 386,447.77