Finding the Fourth Proportional to 42.43, 63.56 and 28.71

Step by Step Solution

1. Step 1: Write the proportion equation
   42.43 : 63.56 = 28.71 : x
2. Step 2: Convert to fraction form
   42.43/63.56 = 28.71/x
3. Step 3: Cross multiply
   42.43x = 63.56 × 28.71
4. Step 4: Simplify right side
   42.43x = 1,824.88
5. Step 5: Solve for x
   x = 1,824.88/42.43
6. Step 6: Final answer
   x = 43.01