Finding the Fourth Proportional to 88.42, 132.42 and 42.80

Step by Step Solution

1. Step 1: Write the proportion equation
   88.42 : 132.42 = 42.80 : x
2. Step 2: Convert to fraction form
   88.42/132.42 = 42.80/x
3. Step 3: Cross multiply
   88.42x = 132.42 × 42.80
4. Step 4: Simplify right side
   88.42x = 5,667.58
5. Step 5: Solve for x
   x = 5,667.58/88.42
6. Step 6: Final answer
   x = 64.10