Finding the Fourth Proportional to 88.47, 132.72 and 42.20

Step by Step Solution

1. Step 1: Write the proportion equation
   88.47 : 132.72 = 42.20 : x
2. Step 2: Convert to fraction form
   88.47/132.72 = 42.20/x
3. Step 3: Cross multiply
   88.47x = 132.72 × 42.20
4. Step 4: Simplify right side
   88.47x = 5,600.12
5. Step 5: Solve for x
   x = 5,600.12/88.47
6. Step 6: Final answer
   x = 63.30