Finding the Fourth Proportional to 82.38, 123.62 and 28.31

Step by Step Solution

1. Step 1: Write the proportion equation
   82.38 : 123.62 = 28.31 : x
2. Step 2: Convert to fraction form
   82.38/123.62 = 28.31/x
3. Step 3: Cross multiply
   82.38x = 123.62 × 28.31
4. Step 4: Simplify right side
   82.38x = 3,499.85
5. Step 5: Solve for x
   x = 3,499.85/82.38
6. Step 6: Final answer
   x = 42.48