Finding the Third Proportional to 643,898 and 1,398,604

Step by Step Solution

1. Step 1: Write the proportion equation
   643,898 : 1,398,604 = 1,398,604 : x
2. Step 2: Convert to fraction form
   643,898/1,398,604 = 1,398,604/x
3. Step 3: Cross multiply
   643,898x = 1,398,604 × 1,398,604
4. Step 4: Simplify right side
   643,898x = 1,956,093,148,816
5. Step 5: Solve for x
   x = 1,956,093,148,816/643,898
6. Step 6: Final answer
   x = 3,037,892.88