Finding the Fourth Proportional to 624,171.57, 862,238.57 and 496,684.05

Step by Step Solution

1. Step 1: Write the proportion equation
   624,171.57 : 862,238.57 = 496,684.05 : x
2. Step 2: Convert to fraction form
   624,171.57/862,238.57 = 496,684.05/x
3. Step 3: Cross multiply
   624,171.57x = 862,238.57 × 496,684.05
4. Step 4: Simplify right side
   624,171.57x = 428,260,142,530.39
5. Step 5: Solve for x
   x = 428,260,142,530.39/624,171.57
6. Step 6: Final answer
   x = 686,125.68