Finding the Fourth Proportional to 127.83, 176.42 and 86.42

Step by Step Solution

1. Step 1: Write the proportion equation
   127.83 : 176.42 = 86.42 : x
2. Step 2: Convert to fraction form
   127.83/176.42 = 86.42/x
3. Step 3: Cross multiply
   127.83x = 176.42 × 86.42
4. Step 4: Simplify right side
   127.83x = 15,245.23
5. Step 5: Solve for x
   x = 15,245.23/127.83
6. Step 6: Final answer
   x = 119.27