Finding the Fourth Proportional to 82.84, 124.24 and 28.72

Step by Step Solution

1. Step 1: Write the proportion equation
   82.84 : 124.24 = 28.72 : x
2. Step 2: Convert to fraction form
   82.84/124.24 = 28.72/x
3. Step 3: Cross multiply
   82.84x = 124.24 × 28.72
4. Step 4: Simplify right side
   82.84x = 3,568.17
5. Step 5: Solve for x
   x = 3,568.17/82.84
6. Step 6: Final answer
   x = 43.07