Finding the Fourth Proportional to 88.55, 132.15 and 78.29

Step by Step Solution

1. Step 1: Write the proportion equation
   88.55 : 132.15 = 78.29 : x
2. Step 2: Convert to fraction form
   88.55/132.15 = 78.29/x
3. Step 3: Cross multiply
   88.55x = 132.15 × 78.29
4. Step 4: Simplify right side
   88.55x = 10,345.63
5. Step 5: Solve for x
   x = 10,345.63/88.55
6. Step 6: Final answer
   x = 116.83