Finding the Fourth Proportional to 127.43, 190.74 and 109.42

Step by Step Solution

1. Step 1: Write the proportion equation
   127.43 : 190.74 = 109.42 : x
2. Step 2: Convert to fraction form
   127.43/190.74 = 109.42/x
3. Step 3: Cross multiply
   127.43x = 190.74 × 109.42
4. Step 4: Simplify right side
   127.43x = 20,870.77
5. Step 5: Solve for x
   x = 20,870.77/127.43
6. Step 6: Final answer
   x = 163.78