Finding the Fourth Proportional to 127.99, 176.61 and 72.71

Step by Step Solution

1. Step 1: Write the proportion equation
   127.99 : 176.61 = 72.71 : x
2. Step 2: Convert to fraction form
   127.99/176.61 = 72.71/x
3. Step 3: Cross multiply
   127.99x = 176.61 × 72.71
4. Step 4: Simplify right side
   127.99x = 12,841.41
5. Step 5: Solve for x
   x = 12,841.41/127.99
6. Step 6: Final answer
   x = 100.33