Finding the Fourth Proportional to 127.69, 176.21 and 72.42

Step by Step Solution

1. Step 1: Write the proportion equation
   127.69 : 176.21 = 72.42 : x
2. Step 2: Convert to fraction form
   127.69/176.21 = 72.42/x
3. Step 3: Cross multiply
   127.69x = 176.21 × 72.42
4. Step 4: Simplify right side
   127.69x = 12,760.77
5. Step 5: Solve for x
   x = 12,760.77/127.69
6. Step 6: Final answer
   x = 99.94