Finding the Fourth Proportional to 518,495.50, 715,524.06 and 280,031.50

Step by Step Solution

1. Step 1: Write the proportion equation
   518,495.50 : 715,524.06 = 280,031.50 : x
2. Step 2: Convert to fraction form
   518,495.50/715,524.06 = 280,031.50/x
3. Step 3: Cross multiply
   518,495.50x = 715,524.06 × 280,031.50
4. Step 4: Simplify right side
   518,495.50x = 200,369,275,807.89
5. Step 5: Solve for x
   x = 200,369,275,807.89/518,495.50
6. Step 6: Final answer
   x = 386,443.62