Finding the Fourth Proportional to 88.56, 132.83 and 42.87

Step by Step Solution

1. Step 1: Write the proportion equation
   88.56 : 132.83 = 42.87 : x
2. Step 2: Convert to fraction form
   88.56/132.83 = 42.87/x
3. Step 3: Cross multiply
   88.56x = 132.83 × 42.87
4. Step 4: Simplify right side
   88.56x = 5,694.42
5. Step 5: Solve for x
   x = 5,694.42/88.56
6. Step 6: Final answer
   x = 64.30