Finding the Fourth Proportional to 123.43, 169.43 and 109.31

Step by Step Solution

1. Step 1: Write the proportion equation
   123.43 : 169.43 = 109.31 : x
2. Step 2: Convert to fraction form
   123.43/169.43 = 109.31/x
3. Step 3: Cross multiply
   123.43x = 169.43 × 109.31
4. Step 4: Simplify right side
   123.43x = 18,520.39
5. Step 5: Solve for x
   x = 18,520.39/123.43
6. Step 6: Final answer
   x = 150.05