Finding the Third Proportional to 640,170 and 1,398,456

Step by Step Solution

1. Step 1: Write the proportion equation
   640,170 : 1,398,456 = 1,398,456 : x
2. Step 2: Convert to fraction form
   640,170/1,398,456 = 1,398,456/x
3. Step 3: Cross multiply
   640,170x = 1,398,456 × 1,398,456
4. Step 4: Simplify right side
   640,170x = 1,955,679,183,936
5. Step 5: Solve for x
   x = 1,955,679,183,936/640,170
6. Step 6: Final answer
   x = 3,054,937.26