Finding the Fourth Proportional to 256,854.69, 385,186.25 and 88,327.31

Step by Step Solution

1. Step 1: Write the proportion equation
   256,854.69 : 385,186.25 = 88,327.31 : x
2. Step 2: Convert to fraction form
   256,854.69/385,186.25 = 88,327.31/x
3. Step 3: Cross multiply
   256,854.69x = 385,186.25 × 88,327.31
4. Step 4: Simplify right side
   256,854.69x = 34,022,463,606.37
5. Step 5: Solve for x
   x = 34,022,463,606.37/256,854.69
6. Step 6: Final answer
   x = 132,458.02