Finding the Fourth Proportional to 71.30, 106.92 and 42.42

Step by Step Solution

1. Step 1: Write the proportion equation
   71.30 : 106.92 = 42.42 : x
2. Step 2: Convert to fraction form
   71.30/106.92 = 42.42/x
3. Step 3: Cross multiply
   71.30x = 106.92 × 42.42
4. Step 4: Simplify right side
   71.30x = 4,535.55
5. Step 5: Solve for x
   x = 4,535.55/71.30
6. Step 6: Final answer
   x = 63.61