Finding the Fourth Proportional to 100.72, 151.08 and 82.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100.72 : 151.08 = 82.72 : x
2. Step 2: Convert to fraction form
   100.72/151.08 = 82.72/x
3. Step 3: Cross multiply
   100.72x = 151.08 × 82.72
4. Step 4: Simplify right side
   100.72x = 12,497.34
5. Step 5: Solve for x
   x = 12,497.34/100.72
6. Step 6: Final answer
   x = 124.08