Finding the Third Proportional to 404,213 and 673,648

Step by Step Solution

1. Step 1: Write the proportion equation
   404,213 : 673,648 = 673,648 : x
2. Step 2: Convert to fraction form
   404,213/673,648 = 673,648/x
3. Step 3: Cross multiply
   404,213x = 673,648 × 673,648
4. Step 4: Simplify right side
   404,213x = 453,801,627,904
5. Step 5: Solve for x
   x = 453,801,627,904/404,213
6. Step 6: Final answer
   x = 1,122,679.45