Finding the Third Proportional to 409,311 and 861,036.75

Step by Step Solution

1. Step 1: Write the proportion equation
   409,311 : 861,036.75 = 861,036.75 : x
2. Step 2: Convert to fraction form
   409,311/861,036.75 = 861,036.75/x
3. Step 3: Cross multiply
   409,311x = 861,036.75 × 861,036.75
4. Step 4: Simplify right side
   409,311x = 741,384,284,850.56
5. Step 5: Solve for x
   x = 741,384,284,850.56/409,311
6. Step 6: Final answer
   x = 1,811,298.22