Finding the Fourth Proportional to 42.48, 63.71 and 15.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42.48 : 63.71 = 15.42 : x
2. Step 2: Convert to fraction form
   42.48/63.71 = 15.42/x
3. Step 3: Cross multiply
   42.48x = 63.71 × 15.42
4. Step 4: Simplify right side
   42.48x = 982.41
5. Step 5: Solve for x
   x = 982.41/42.48
6. Step 6: Final answer
   x = 23.13