Finding the Fourth Proportional to 231,066.90, 318,860.91 and 129,072.12

Step by Step Solution

1. Step 1: Write the proportion equation
   231,066.90 : 318,860.91 = 129,072.12 : x
2. Step 2: Convert to fraction form
   231,066.90/318,860.91 = 129,072.12/x
3. Step 3: Cross multiply
   231,066.90x = 318,860.91 × 129,072.12
4. Step 4: Simplify right side
   231,066.90x = 41,156,053,638.83
5. Step 5: Solve for x
   x = 41,156,053,638.83/231,066.90
6. Step 6: Final answer
   x = 178,113.15