Finding the Third Proportional to 320,403.38 and 682,218

Step by Step Solution

1. Step 1: Write the proportion equation
   320,403.38 : 682,218 = 682,218 : x
2. Step 2: Convert to fraction form
   320,403.38/682,218 = 682,218/x
3. Step 3: Cross multiply
   320,403.38x = 682,218 × 682,218
4. Step 4: Simplify right side
   320,403.38x = 465,421,399,524
5. Step 5: Solve for x
   x = 465,421,399,524/320,403.38
6. Step 6: Final answer
   x = 1,452,610.79