Finding the Third Proportional to 404,210 and 673,643

Step by Step Solution

1. Step 1: Write the proportion equation
   404,210 : 673,643 = 673,643 : x
2. Step 2: Convert to fraction form
   404,210/673,643 = 673,643/x
3. Step 3: Cross multiply
   404,210x = 673,643 × 673,643
4. Step 4: Simplify right side
   404,210x = 453,794,891,449
5. Step 5: Solve for x
   x = 453,794,891,449/404,210
6. Step 6: Final answer
   x = 1,122,671.12