Finding the Fourth Proportional to 82.59, 123.89 and 28.49

Step by Step Solution

1. Step 1: Write the proportion equation
   82.59 : 123.89 = 28.49 : x
2. Step 2: Convert to fraction form
   82.59/123.89 = 28.49/x
3. Step 3: Cross multiply
   82.59x = 123.89 × 28.49
4. Step 4: Simplify right side
   82.59x = 3,529.08
5. Step 5: Solve for x
   x = 3,529.08/82.59
6. Step 6: Final answer
   x = 42.73