Finding the Third Proportional to 645,808 and 1,407,872

Step by Step Solution

1. Step 1: Write the proportion equation
   645,808 : 1,407,872 = 1,407,872 : x
2. Step 2: Convert to fraction form
   645,808/1,407,872 = 1,407,872/x
3. Step 3: Cross multiply
   645,808x = 1,407,872 × 1,407,872
4. Step 4: Simplify right side
   645,808x = 1,982,103,568,384
5. Step 5: Solve for x
   x = 1,982,103,568,384/645,808
6. Step 6: Final answer
   x = 3,069,183.98