Finding the Fourth Proportional to 686,359.50, 947,176.12 and 418,087.50

Step by Step Solution

1. Step 1: Write the proportion equation
   686,359.50 : 947,176.12 = 418,087.50 : x
2. Step 2: Convert to fraction form
   686,359.50/947,176.12 = 418,087.50/x
3. Step 3: Cross multiply
   686,359.50x = 947,176.12 × 418,087.50
4. Step 4: Simplify right side
   686,359.50x = 396,002,496,070.50
5. Step 5: Solve for x
   x = 396,002,496,070.50/686,359.50
6. Step 6: Final answer
   x = 576,960.76