Finding the Fourth Proportional to 231,104.61, 318,912.71 and 129,109.82

Step by Step Solution

1. Step 1: Write the proportion equation
   231,104.61 : 318,912.71 = 129,109.82 : x
2. Step 2: Convert to fraction form
   231,104.61/318,912.71 = 129,109.82/x
3. Step 3: Cross multiply
   231,104.61x = 318,912.71 × 129,109.82
4. Step 4: Simplify right side
   231,104.61x = 41,174,760,343.70
5. Step 5: Solve for x
   x = 41,174,760,343.70/231,104.61
6. Step 6: Final answer
   x = 178,165.03