Finding the Third Proportional to 643,972 and 1,398,563

Step by Step Solution

1. Step 1: Write the proportion equation
   643,972 : 1,398,563 = 1,398,563 : x
2. Step 2: Convert to fraction form
   643,972/1,398,563 = 1,398,563/x
3. Step 3: Cross multiply
   643,972x = 1,398,563 × 1,398,563
4. Step 4: Simplify right side
   643,972x = 1,955,978,464,969
5. Step 5: Solve for x
   x = 1,955,978,464,969/643,972
6. Step 6: Final answer
   x = 3,037,365.70