Finding the Fourth Proportional to 423,520.96, 635,146.50 and 139,145.48

Step by Step Solution

1. Step 1: Write the proportion equation
   423,520.96 : 635,146.50 = 139,145.48 : x
2. Step 2: Convert to fraction form
   423,520.96/635,146.50 = 139,145.48/x
3. Step 3: Cross multiply
   423,520.96x = 635,146.50 × 139,145.48
4. Step 4: Simplify right side
   423,520.96x = 88,377,764,612.82
5. Step 5: Solve for x
   x = 88,377,764,612.82/423,520.96
6. Step 6: Final answer
   x = 208,673.89