Finding the Third Proportional to 320,550 and 685,570

Step by Step Solution

1. Step 1: Write the proportion equation
   320,550 : 685,570 = 685,570 : x
2. Step 2: Convert to fraction form
   320,550/685,570 = 685,570/x
3. Step 3: Cross multiply
   320,550x = 685,570 × 685,570
4. Step 4: Simplify right side
   320,550x = 470,006,224,900
5. Step 5: Solve for x
   x = 470,006,224,900/320,550
6. Step 6: Final answer
   x = 1,466,249.34