Finding the Fourth Proportional to 102.72, 153.33 and 82.24

Step by Step Solution

1. Step 1: Write the proportion equation
   102.72 : 153.33 = 82.24 : x
2. Step 2: Convert to fraction form
   102.72/153.33 = 82.24/x
3. Step 3: Cross multiply
   102.72x = 153.33 × 82.24
4. Step 4: Simplify right side
   102.72x = 12,609.86
5. Step 5: Solve for x
   x = 12,609.86/102.72
6. Step 6: Final answer
   x = 122.76