Finding the Third Proportional to 679,312 and 1,439,540

Step by Step Solution

1. Step 1: Write the proportion equation
   679,312 : 1,439,540 = 1,439,540 : x
2. Step 2: Convert to fraction form
   679,312/1,439,540 = 1,439,540/x
3. Step 3: Cross multiply
   679,312x = 1,439,540 × 1,439,540
4. Step 4: Simplify right side
   679,312x = 2,072,275,411,600
5. Step 5: Solve for x
   x = 2,072,275,411,600/679,312
6. Step 6: Final answer
   x = 3,050,550.28