Finding the Fourth Proportional to 71.24, 106.77 and 42.38

Step by Step Solution

1. Step 1: Write the proportion equation
   71.24 : 106.77 = 42.38 : x
2. Step 2: Convert to fraction form
   71.24/106.77 = 42.38/x
3. Step 3: Cross multiply
   71.24x = 106.77 × 42.38
4. Step 4: Simplify right side
   71.24x = 4,524.91
5. Step 5: Solve for x
   x = 4,524.91/71.24
6. Step 6: Final answer
   x = 63.52