Finding the Third Proportional to 646,678 and 1,410,828

Step by Step Solution

1. Step 1: Write the proportion equation
   646,678 : 1,410,828 = 1,410,828 : x
2. Step 2: Convert to fraction form
   646,678/1,410,828 = 1,410,828/x
3. Step 3: Cross multiply
   646,678x = 1,410,828 × 1,410,828
4. Step 4: Simplify right side
   646,678x = 1,990,435,645,584
5. Step 5: Solve for x
   x = 1,990,435,645,584/646,678
6. Step 6: Final answer
   x = 3,077,939.32