Finding the Third Proportional to 1,378,721 and 2,069,540

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378,721 : 2,069,540 = 2,069,540 : x
2. Step 2: Convert to fraction form
   1,378,721/2,069,540 = 2,069,540/x
3. Step 3: Cross multiply
   1,378,721x = 2,069,540 × 2,069,540
4. Step 4: Simplify right side
   1,378,721x = 4,282,995,811,600
5. Step 5: Solve for x
   x = 4,282,995,811,600/1,378,721
6. Step 6: Final answer
   x = 3,106,499.29