Finding the Fourth Proportional to 82.85, 124.29 and 42.30

Step by Step Solution

1. Step 1: Write the proportion equation
   82.85 : 124.29 = 42.30 : x
2. Step 2: Convert to fraction form
   82.85/124.29 = 42.30/x
3. Step 3: Cross multiply
   82.85x = 124.29 × 42.30
4. Step 4: Simplify right side
   82.85x = 5,257.47
5. Step 5: Solve for x
   x = 5,257.47/82.85
6. Step 6: Final answer
   x = 63.46