Finding the Fourth Proportional to 82.88, 124.27 and 42.23

Step by Step Solution

1. Step 1: Write the proportion equation
   82.88 : 124.27 = 42.23 : x
2. Step 2: Convert to fraction form
   82.88/124.27 = 42.23/x
3. Step 3: Cross multiply
   82.88x = 124.27 × 42.23
4. Step 4: Simplify right side
   82.88x = 5,247.20
5. Step 5: Solve for x
   x = 5,247.20/82.88
6. Step 6: Final answer
   x = 63.31