Finding the Third Proportional to 679,718 and 1,389,028

Step by Step Solution

1. Step 1: Write the proportion equation
   679,718 : 1,389,028 = 1,389,028 : x
2. Step 2: Convert to fraction form
   679,718/1,389,028 = 1,389,028/x
3. Step 3: Cross multiply
   679,718x = 1,389,028 × 1,389,028
4. Step 4: Simplify right side
   679,718x = 1,929,398,784,784
5. Step 5: Solve for x
   x = 1,929,398,784,784/679,718
6. Step 6: Final answer
   x = 2,838,528.31