Finding the Third Proportional to 643,982 and 1,398,608

Step by Step Solution

1. Step 1: Write the proportion equation
   643,982 : 1,398,608 = 1,398,608 : x
2. Step 2: Convert to fraction form
   643,982/1,398,608 = 1,398,608/x
3. Step 3: Cross multiply
   643,982x = 1,398,608 × 1,398,608
4. Step 4: Simplify right side
   643,982x = 1,956,104,337,664
5. Step 5: Solve for x
   x = 1,956,104,337,664/643,982
6. Step 6: Final answer
   x = 3,037,514.00