Finding the Third Proportional to 855,643.50 and 1,280,799

Step by Step Solution

1. Step 1: Write the proportion equation
   855,643.50 : 1,280,799 = 1,280,799 : x
2. Step 2: Convert to fraction form
   855,643.50/1,280,799 = 1,280,799/x
3. Step 3: Cross multiply
   855,643.50x = 1,280,799 × 1,280,799
4. Step 4: Simplify right side
   855,643.50x = 1,640,446,078,401
5. Step 5: Solve for x
   x = 1,640,446,078,401/855,643.50
6. Step 6: Final answer
   x = 1,917,207.43