Finding the Fourth Proportional to 82.26, 123.38 and 28.15

Step by Step Solution

1. Step 1: Write the proportion equation
   82.26 : 123.38 = 28.15 : x
2. Step 2: Convert to fraction form
   82.26/123.38 = 28.15/x
3. Step 3: Cross multiply
   82.26x = 123.38 × 28.15
4. Step 4: Simplify right side
   82.26x = 3,473.01
5. Step 5: Solve for x
   x = 3,473.01/82.26
6. Step 6: Final answer
   x = 42.22