Finding the Fourth Proportional to 127.76, 176.31 and 72.49

Step by Step Solution

1. Step 1: Write the proportion equation
   127.76 : 176.31 = 72.49 : x
2. Step 2: Convert to fraction form
   127.76/176.31 = 72.49/x
3. Step 3: Cross multiply
   127.76x = 176.31 × 72.49
4. Step 4: Simplify right side
   127.76x = 12,781.15
5. Step 5: Solve for x
   x = 12,781.15/127.76
6. Step 6: Final answer
   x = 100.04