Finding the Fourth Proportional to 82.28, 123.38 and 28.18

Step by Step Solution

1. Step 1: Write the proportion equation
   82.28 : 123.38 = 28.18 : x
2. Step 2: Convert to fraction form
   82.28/123.38 = 28.18/x
3. Step 3: Cross multiply
   82.28x = 123.38 × 28.18
4. Step 4: Simplify right side
   82.28x = 3,476.85
5. Step 5: Solve for x
   x = 3,476.85/82.28
6. Step 6: Final answer
   x = 42.26