Finding the Third Proportional to 643,910 and 1,398,532

Step by Step Solution

1. Step 1: Write the proportion equation
   643,910 : 1,398,532 = 1,398,532 : x
2. Step 2: Convert to fraction form
   643,910/1,398,532 = 1,398,532/x
3. Step 3: Cross multiply
   643,910x = 1,398,532 × 1,398,532
4. Step 4: Simplify right side
   643,910x = 1,955,891,755,024
5. Step 5: Solve for x
   x = 1,955,891,755,024/643,910
6. Step 6: Final answer
   x = 3,037,523.50