Finding the Third Proportional to 1,728,378 and 2,489,616

Step by Step Solution

1. Step 1: Write the proportion equation
   1,728,378 : 2,489,616 = 2,489,616 : x
2. Step 2: Convert to fraction form
   1,728,378/2,489,616 = 2,489,616/x
3. Step 3: Cross multiply
   1,728,378x = 2,489,616 × 2,489,616
4. Step 4: Simplify right side
   1,728,378x = 6,198,187,827,456
5. Step 5: Solve for x
   x = 6,198,187,827,456/1,728,378
6. Step 6: Final answer
   x = 3,586,129.79