Finding the Fourth Proportional to 102.72, 153.84 and 83.52

Step by Step Solution

1. Step 1: Write the proportion equation
   102.72 : 153.84 = 83.52 : x
2. Step 2: Convert to fraction form
   102.72/153.84 = 83.52/x
3. Step 3: Cross multiply
   102.72x = 153.84 × 83.52
4. Step 4: Simplify right side
   102.72x = 12,848.72
5. Step 5: Solve for x
   x = 12,848.72/102.72
6. Step 6: Final answer
   x = 125.08