Finding the Fourth Proportional to 89,111.75, 132,531.39 and 86,867.37

Step by Step Solution

1. Step 1: Write the proportion equation
   89,111.75 : 132,531.39 = 86,867.37 : x
2. Step 2: Convert to fraction form
   89,111.75/132,531.39 = 86,867.37/x
3. Step 3: Cross multiply
   89,111.75x = 132,531.39 × 86,867.37
4. Step 4: Simplify right side
   89,111.75x = 11,512,653,291.74
5. Step 5: Solve for x
   x = 11,512,653,291.74/89,111.75
6. Step 6: Final answer
   x = 129,193.44