Finding the Fourth Proportional to 127.56, 175.98 and 78.42

Step by Step Solution

1. Step 1: Write the proportion equation
   127.56 : 175.98 = 78.42 : x
2. Step 2: Convert to fraction form
   127.56/175.98 = 78.42/x
3. Step 3: Cross multiply
   127.56x = 175.98 × 78.42
4. Step 4: Simplify right side
   127.56x = 13,800.35
5. Step 5: Solve for x
   x = 13,800.35/127.56
6. Step 6: Final answer
   x = 108.19