Finding the Fourth Proportional to 82.75, 124.18 and 42.20

Step by Step Solution

1. Step 1: Write the proportion equation
   82.75 : 124.18 = 42.20 : x
2. Step 2: Convert to fraction form
   82.75/124.18 = 42.20/x
3. Step 3: Cross multiply
   82.75x = 124.18 × 42.20
4. Step 4: Simplify right side
   82.75x = 5,240.02
5. Step 5: Solve for x
   x = 5,240.02/82.75
6. Step 6: Final answer
   x = 63.33