Finding the Fourth Proportional to 127.28, 175.72 and 78.24

Step by Step Solution

1. Step 1: Write the proportion equation
   127.28 : 175.72 = 78.24 : x
2. Step 2: Convert to fraction form
   127.28/175.72 = 78.24/x
3. Step 3: Cross multiply
   127.28x = 175.72 × 78.24
4. Step 4: Simplify right side
   127.28x = 13,748.33
5. Step 5: Solve for x
   x = 13,748.33/127.28
6. Step 6: Final answer
   x = 108.02