Finding the Fourth Proportional to 861,436.52, 1,188,821.76 and 479,487.90

Step by Step Solution

1. Step 1: Write the proportion equation
   861,436.52 : 1,188,821.76 = 479,487.90 : x
2. Step 2: Convert to fraction form
   861,436.52/1,188,821.76 = 479,487.90/x
3. Step 3: Cross multiply
   861,436.52x = 1,188,821.76 × 479,487.90
4. Step 4: Simplify right side
   861,436.52x = 570,025,654,533.83
5. Step 5: Solve for x
   x = 570,025,654,533.83/861,436.52
6. Step 6: Final answer
   x = 661,715.22