Finding the Third Proportional to 67.92 and 140.49

Step by Step Solution

1. Step 1: Write the proportion equation
   67.92 : 140.49 = 140.49 : x
2. Step 2: Convert to fraction form
   67.92/140.49 = 140.49/x
3. Step 3: Cross multiply
   67.92x = 140.49 × 140.49
4. Step 4: Simplify right side
   67.92x = 19,738.05
5. Step 5: Solve for x
   x = 19,738.05/67.92
6. Step 6: Final answer
   x = 290.60