Finding the Fourth Proportional to 82.68, 123.98 and 28.58

Step by Step Solution

1. Step 1: Write the proportion equation
   82.68 : 123.98 = 28.58 : x
2. Step 2: Convert to fraction form
   82.68/123.98 = 28.58/x
3. Step 3: Cross multiply
   82.68x = 123.98 × 28.58
4. Step 4: Simplify right side
   82.68x = 3,543.35
5. Step 5: Solve for x
   x = 3,543.35/82.68
6. Step 6: Final answer
   x = 42.86