Finding the Fourth Proportional to 82.27, 123.42 and 28.15

Step by Step Solution

1. Step 1: Write the proportion equation
   82.27 : 123.42 = 28.15 : x
2. Step 2: Convert to fraction form
   82.27/123.42 = 28.15/x
3. Step 3: Cross multiply
   82.27x = 123.42 × 28.15
4. Step 4: Simplify right side
   82.27x = 3,473.86
5. Step 5: Solve for x
   x = 3,473.86/82.27
6. Step 6: Final answer
   x = 42.23