Finding the Fourth Proportional to 87.89, 131.84 and 42.28

Step by Step Solution

1. Step 1: Write the proportion equation
   87.89 : 131.84 = 42.28 : x
2. Step 2: Convert to fraction form
   87.89/131.84 = 42.28/x
3. Step 3: Cross multiply
   87.89x = 131.84 × 42.28
4. Step 4: Simplify right side
   87.89x = 5,574.42
5. Step 5: Solve for x
   x = 5,574.42/87.89
6. Step 6: Final answer
   x = 63.42