Finding the Fourth Proportional to 82.81, 124.22 and 42.22

Step by Step Solution

1. Step 1: Write the proportion equation
   82.81 : 124.22 = 42.22 : x
2. Step 2: Convert to fraction form
   82.81/124.22 = 42.22/x
3. Step 3: Cross multiply
   82.81x = 124.22 × 42.22
4. Step 4: Simplify right side
   82.81x = 5,244.57
5. Step 5: Solve for x
   x = 5,244.57/82.81
6. Step 6: Final answer
   x = 63.33