Finding the Fourth Proportional to 127.29, 175.71 and 78.18

Step by Step Solution

1. Step 1: Write the proportion equation
   127.29 : 175.71 = 78.18 : x
2. Step 2: Convert to fraction form
   127.29/175.71 = 78.18/x
3. Step 3: Cross multiply
   127.29x = 175.71 × 78.18
4. Step 4: Simplify right side
   127.29x = 13,737.01
5. Step 5: Solve for x
   x = 13,737.01/127.29
6. Step 6: Final answer
   x = 107.92