Finding the Fourth Proportional to 127.69, 176.23 and 123.42

Step by Step Solution

1. Step 1: Write the proportion equation
   127.69 : 176.23 = 123.42 : x
2. Step 2: Convert to fraction form
   127.69/176.23 = 123.42/x
3. Step 3: Cross multiply
   127.69x = 176.23 × 123.42
4. Step 4: Simplify right side
   127.69x = 21,749.43
5. Step 5: Solve for x
   x = 21,749.43/127.69
6. Step 6: Final answer
   x = 170.34