Finding the Fourth Proportional to 88.42, 132.01 and 80.72

Step by Step Solution

1. Step 1: Write the proportion equation
   88.42 : 132.01 = 80.72 : x
2. Step 2: Convert to fraction form
   88.42/132.01 = 80.72/x
3. Step 3: Cross multiply
   88.42x = 132.01 × 80.72
4. Step 4: Simplify right side
   88.42x = 10,655.85
5. Step 5: Solve for x
   x = 10,655.85/88.42
6. Step 6: Final answer
   x = 120.51