Finding the Fourth Proportional to 424,142.91, 635,974.17 and 139,756.35

Step by Step Solution

1. Step 1: Write the proportion equation
   424,142.91 : 635,974.17 = 139,756.35 : x
2. Step 2: Convert to fraction form
   424,142.91/635,974.17 = 139,756.35/x
3. Step 3: Cross multiply
   424,142.91x = 635,974.17 × 139,756.35
4. Step 4: Simplify right side
   424,142.91x = 88,881,428,693.48
5. Step 5: Solve for x
   x = 88,881,428,693.48/424,142.91
6. Step 6: Final answer
   x = 209,555.38