Finding the Third Proportional to 639,198 and 1,398,708

Step by Step Solution

1. Step 1: Write the proportion equation
   639,198 : 1,398,708 = 1,398,708 : x
2. Step 2: Convert to fraction form
   639,198/1,398,708 = 1,398,708/x
3. Step 3: Cross multiply
   639,198x = 1,398,708 × 1,398,708
4. Step 4: Simplify right side
   639,198x = 1,956,384,069,264
5. Step 5: Solve for x
   x = 1,956,384,069,264/639,198
6. Step 6: Final answer
   x = 3,060,685.53