Finding the Fourth Proportional to 231,131.88, 318,955.88 and 129,158.18

Step by Step Solution

1. Step 1: Write the proportion equation
   231,131.88 : 318,955.88 = 129,158.18 : x
2. Step 2: Convert to fraction form
   231,131.88/318,955.88 = 129,158.18/x
3. Step 3: Cross multiply
   231,131.88x = 318,955.88 × 129,158.18
4. Step 4: Simplify right side
   231,131.88x = 41,195,760,961.10
5. Step 5: Solve for x
   x = 41,195,760,961.10/231,131.88
6. Step 6: Final answer
   x = 178,234.87