Finding the Third Proportional to 172.13 and 451.69

Step by Step Solution

1. Step 1: Write the proportion equation
   172.13 : 451.69 = 451.69 : x
2. Step 2: Convert to fraction form
   172.13/451.69 = 451.69/x
3. Step 3: Cross multiply
   172.13x = 451.69 × 451.69
4. Step 4: Simplify right side
   172.13x = 204,021.60
5. Step 5: Solve for x
   x = 204,021.60/172.13
6. Step 6: Final answer
   x = 1,185.31