Finding the Fourth Proportional to 88.47, 132.63 and 42.78

Step by Step Solution

1. Step 1: Write the proportion equation
   88.47 : 132.63 = 42.78 : x
2. Step 2: Convert to fraction form
   88.47/132.63 = 42.78/x
3. Step 3: Cross multiply
   88.47x = 132.63 × 42.78
4. Step 4: Simplify right side
   88.47x = 5,673.91
5. Step 5: Solve for x
   x = 5,673.91/88.47
6. Step 6: Final answer
   x = 64.13