Finding the Fourth Proportional to 82.69, 124.05 and 28.58

Step by Step Solution

1. Step 1: Write the proportion equation
   82.69 : 124.05 = 28.58 : x
2. Step 2: Convert to fraction form
   82.69/124.05 = 28.58/x
3. Step 3: Cross multiply
   82.69x = 124.05 × 28.58
4. Step 4: Simplify right side
   82.69x = 3,545.67
5. Step 5: Solve for x
   x = 3,545.67/82.69
6. Step 6: Final answer
   x = 42.88