Finding the Fourth Proportional to 231,111.87, 318,935.98 and 129,141.63

Step by Step Solution

1. Step 1: Write the proportion equation
   231,111.87 : 318,935.98 = 129,141.63 : x
2. Step 2: Convert to fraction form
   231,111.87/318,935.98 = 129,141.63/x
3. Step 3: Cross multiply
   231,111.87x = 318,935.98 × 129,141.63
4. Step 4: Simplify right side
   231,111.87x = 41,187,912,322.85
5. Step 5: Solve for x
   x = 41,187,912,322.85/231,111.87
6. Step 6: Final answer
   x = 178,216.34