Finding the Fourth Proportional to 82.86, 124.34 and 34.15

Step by Step Solution

1. Step 1: Write the proportion equation
   82.86 : 124.34 = 34.15 : x
2. Step 2: Convert to fraction form
   82.86/124.34 = 34.15/x
3. Step 3: Cross multiply
   82.86x = 124.34 × 34.15
4. Step 4: Simplify right side
   82.86x = 4,245.91
5. Step 5: Solve for x
   x = 4,245.91/82.86
6. Step 6: Final answer
   x = 51.24