Finding the Fourth Proportional to 88,399.20, 132,339.60 and 78,031.20

Step by Step Solution

1. Step 1: Write the proportion equation
   88,399.20 : 132,339.60 = 78,031.20 : x
2. Step 2: Convert to fraction form
   88,399.20/132,339.60 = 78,031.20/x
3. Step 3: Cross multiply
   88,399.20x = 132,339.60 × 78,031.20
4. Step 4: Simplify right side
   88,399.20x = 10,326,617,795.52
5. Step 5: Solve for x
   x = 10,326,617,795.52/88,399.20
6. Step 6: Final answer
   x = 116,818.00