Finding the Third Proportional to 121.88 and 142.69

Step by Step Solution

1. Step 1: Write the proportion equation
   121.88 : 142.69 = 142.69 : x
2. Step 2: Convert to fraction form
   121.88/142.69 = 142.69/x
3. Step 3: Cross multiply
   121.88x = 142.69 × 142.69
4. Step 4: Simplify right side
   121.88x = 20,359.72
5. Step 5: Solve for x
   x = 20,359.72/121.88
6. Step 6: Final answer
   x = 167.05