Finding the Fourth Proportional to 88.45, 132.72 and 42.79

Step by Step Solution

1. Step 1: Write the proportion equation
   88.45 : 132.72 = 42.79 : x
2. Step 2: Convert to fraction form
   88.45/132.72 = 42.79/x
3. Step 3: Cross multiply
   88.45x = 132.72 × 42.79
4. Step 4: Simplify right side
   88.45x = 5,679.09
5. Step 5: Solve for x
   x = 5,679.09/88.45
6. Step 6: Final answer
   x = 64.21