Finding the Fourth Proportional to 82.76, 123.98 and 68.31

Step by Step Solution

1. Step 1: Write the proportion equation
   82.76 : 123.98 = 68.31 : x
2. Step 2: Convert to fraction form
   82.76/123.98 = 68.31/x
3. Step 3: Cross multiply
   82.76x = 123.98 × 68.31
4. Step 4: Simplify right side
   82.76x = 8,468.73
5. Step 5: Solve for x
   x = 8,468.73/82.76
6. Step 6: Final answer
   x = 102.33