Finding the Fourth Proportional to 423,501.18, 635,116.89 and 139,125.72

Step by Step Solution

1. Step 1: Write the proportion equation
   423,501.18 : 635,116.89 = 139,125.72 : x
2. Step 2: Convert to fraction form
   423,501.18/635,116.89 = 139,125.72/x
3. Step 3: Cross multiply
   423,501.18x = 635,116.89 × 139,125.72
4. Step 4: Simplify right side
   423,501.18x = 88,361,091,429.83
5. Step 5: Solve for x
   x = 88,361,091,429.83/423,501.18
6. Step 6: Final answer
   x = 208,644.27