Finding the Third Proportional to 643,906 and 1,398,524

Step by Step Solution

1. Step 1: Write the proportion equation
   643,906 : 1,398,524 = 1,398,524 : x
2. Step 2: Convert to fraction form
   643,906/1,398,524 = 1,398,524/x
3. Step 3: Cross multiply
   643,906x = 1,398,524 × 1,398,524
4. Step 4: Simplify right side
   643,906x = 1,955,869,378,576
5. Step 5: Solve for x
   x = 1,955,869,378,576/643,906
6. Step 6: Final answer
   x = 3,037,507.62