Finding the Third Proportional to 646,640 and 1,403,872

Step by Step Solution

1. Step 1: Write the proportion equation
   646,640 : 1,403,872 = 1,403,872 : x
2. Step 2: Convert to fraction form
   646,640/1,403,872 = 1,403,872/x
3. Step 3: Cross multiply
   646,640x = 1,403,872 × 1,403,872
4. Step 4: Simplify right side
   646,640x = 1,970,856,592,384
5. Step 5: Solve for x
   x = 1,970,856,592,384/646,640
6. Step 6: Final answer
   x = 3,047,842.06