Finding the Third Proportional to 811,438 and 1,261,408

Step by Step Solution

1. Step 1: Write the proportion equation
   811,438 : 1,261,408 = 1,261,408 : x
2. Step 2: Convert to fraction form
   811,438/1,261,408 = 1,261,408/x
3. Step 3: Cross multiply
   811,438x = 1,261,408 × 1,261,408
4. Step 4: Simplify right side
   811,438x = 1,591,150,142,464
5. Step 5: Solve for x
   x = 1,591,150,142,464/811,438
6. Step 6: Final answer
   x = 1,960,901.69