Finding the Fourth Proportional to 88.42, 132.57 and 42.72

Step by Step Solution

1. Step 1: Write the proportion equation
   88.42 : 132.57 = 42.72 : x
2. Step 2: Convert to fraction form
   88.42/132.57 = 42.72/x
3. Step 3: Cross multiply
   88.42x = 132.57 × 42.72
4. Step 4: Simplify right side
   88.42x = 5,663.39
5. Step 5: Solve for x
   x = 5,663.39/88.42
6. Step 6: Final answer
   x = 64.05