Finding the Fourth Proportional to 88.58, 132.81 and 42.90

Step by Step Solution

1. Step 1: Write the proportion equation
   88.58 : 132.81 = 42.90 : x
2. Step 2: Convert to fraction form
   88.58/132.81 = 42.90/x
3. Step 3: Cross multiply
   88.58x = 132.81 × 42.90
4. Step 4: Simplify right side
   88.58x = 5,696.89
5. Step 5: Solve for x
   x = 5,696.89/88.58
6. Step 6: Final answer
   x = 64.31