Finding the Third Proportional to 789,399 and 1,661,321

Step by Step Solution

1. Step 1: Write the proportion equation
   789,399 : 1,661,321 = 1,661,321 : x
2. Step 2: Convert to fraction form
   789,399/1,661,321 = 1,661,321/x
3. Step 3: Cross multiply
   789,399x = 1,661,321 × 1,661,321
4. Step 4: Simplify right side
   789,399x = 2,759,987,465,041
5. Step 5: Solve for x
   x = 2,759,987,465,041/789,399
6. Step 6: Final answer
   x = 3,496,314.87