Finding the Fourth Proportional to 82.78, 124.11 and 28.69

Step by Step Solution

1. Step 1: Write the proportion equation
   82.78 : 124.11 = 28.69 : x
2. Step 2: Convert to fraction form
   82.78/124.11 = 28.69/x
3. Step 3: Cross multiply
   82.78x = 124.11 × 28.69
4. Step 4: Simplify right side
   82.78x = 3,560.10
5. Step 5: Solve for x
   x = 3,560.10/82.78
6. Step 6: Final answer
   x = 43.01