Finding the Fourth Proportional to 80.71, 121.02 and 42.22

Step by Step Solution

1. Step 1: Write the proportion equation
   80.71 : 121.02 = 42.22 : x
2. Step 2: Convert to fraction form
   80.71/121.02 = 42.22/x
3. Step 3: Cross multiply
   80.71x = 121.02 × 42.22
4. Step 4: Simplify right side
   80.71x = 5,109.46
5. Step 5: Solve for x
   x = 5,109.46/80.71
6. Step 6: Final answer
   x = 63.31