Finding the Fourth Proportional to 82.72, 124.04 and 28.60

Step by Step Solution

1. Step 1: Write the proportion equation
   82.72 : 124.04 = 28.60 : x
2. Step 2: Convert to fraction form
   82.72/124.04 = 28.60/x
3. Step 3: Cross multiply
   82.72x = 124.04 × 28.60
4. Step 4: Simplify right side
   82.72x = 3,546.78
5. Step 5: Solve for x
   x = 3,546.78/82.72
6. Step 6: Final answer
   x = 42.88