Finding the Fourth Proportional to 439,061.32, 658,689.18 and 139,633.48

Step by Step Solution

1. Step 1: Write the proportion equation
   439,061.32 : 658,689.18 = 139,633.48 : x
2. Step 2: Convert to fraction form
   439,061.32/658,689.18 = 139,633.48/x
3. Step 3: Cross multiply
   439,061.32x = 658,689.18 × 139,633.48
4. Step 4: Simplify right side
   439,061.32x = 91,975,062,441.75
5. Step 5: Solve for x
   x = 91,975,062,441.75/439,061.32
6. Step 6: Final answer
   x = 209,481.13