Finding the Fourth Proportional to 127.68, 176.18 and 72.42

Step by Step Solution

1. Step 1: Write the proportion equation
   127.68 : 176.18 = 72.42 : x
2. Step 2: Convert to fraction form
   127.68/176.18 = 72.42/x
3. Step 3: Cross multiply
   127.68x = 176.18 × 72.42
4. Step 4: Simplify right side
   127.68x = 12,758.96
5. Step 5: Solve for x
   x = 12,758.96/127.68
6. Step 6: Final answer
   x = 99.93