Finding the Fourth Proportional to 231,100.11, 318,906.50 and 129,105.32

Step by Step Solution

1. Step 1: Write the proportion equation
   231,100.11 : 318,906.50 = 129,105.32 : x
2. Step 2: Convert to fraction form
   231,100.11/318,906.50 = 129,105.32/x
3. Step 3: Cross multiply
   231,100.11x = 318,906.50 × 129,105.32
4. Step 4: Simplify right side
   231,100.11x = 41,172,523,492.52
5. Step 5: Solve for x
   x = 41,172,523,492.52/231,100.11
6. Step 6: Final answer
   x = 178,158.82