Finding the Fourth Proportional to 82.43, 123.57 and 28.29

Step by Step Solution

1. Step 1: Write the proportion equation
   82.43 : 123.57 = 28.29 : x
2. Step 2: Convert to fraction form
   82.43/123.57 = 28.29/x
3. Step 3: Cross multiply
   82.43x = 123.57 × 28.29
4. Step 4: Simplify right side
   82.43x = 3,495.80
5. Step 5: Solve for x
   x = 3,495.80/82.43
6. Step 6: Final answer
   x = 42.41