Finding the Third Proportional to 309,717 and 685,762.03

Step by Step Solution

1. Step 1: Write the proportion equation
   309,717 : 685,762.03 = 685,762.03 : x
2. Step 2: Convert to fraction form
   309,717/685,762.03 = 685,762.03/x
3. Step 3: Cross multiply
   309,717x = 685,762.03 × 685,762.03
4. Step 4: Simplify right side
   309,717x = 470,269,563,504.13
5. Step 5: Solve for x
   x = 470,269,563,504.13/309,717
6. Step 6: Final answer
   x = 1,518,384.73