Finding the Fourth Proportional to 82.06, 123.12 and 68.50

Step by Step Solution

1. Step 1: Write the proportion equation
   82.06 : 123.12 = 68.50 : x
2. Step 2: Convert to fraction form
   82.06/123.12 = 68.50/x
3. Step 3: Cross multiply
   82.06x = 123.12 × 68.50
4. Step 4: Simplify right side
   82.06x = 8,433.72
5. Step 5: Solve for x
   x = 8,433.72/82.06
6. Step 6: Final answer
   x = 102.78