Finding the Fourth Proportional to 82.49, 123.12 and 82.28

Step by Step Solution

1. Step 1: Write the proportion equation
   82.49 : 123.12 = 82.28 : x
2. Step 2: Convert to fraction form
   82.49/123.12 = 82.28/x
3. Step 3: Cross multiply
   82.49x = 123.12 × 82.28
4. Step 4: Simplify right side
   82.49x = 10,129.70
5. Step 5: Solve for x
   x = 10,129.70/82.49
6. Step 6: Final answer
   x = 122.81