Finding the Third Proportional to 811,638 and 1,261,665

Step by Step Solution

1. Step 1: Write the proportion equation
   811,638 : 1,261,665 = 1,261,665 : x
2. Step 2: Convert to fraction form
   811,638/1,261,665 = 1,261,665/x
3. Step 3: Cross multiply
   811,638x = 1,261,665 × 1,261,665
4. Step 4: Simplify right side
   811,638x = 1,591,798,572,225
5. Step 5: Solve for x
   x = 1,591,798,572,225/811,638
6. Step 6: Final answer
   x = 1,961,217.41