Finding the Third Proportional to 409,812 and 839,856

Step by Step Solution

1. Step 1: Write the proportion equation
   409,812 : 839,856 = 839,856 : x
2. Step 2: Convert to fraction form
   409,812/839,856 = 839,856/x
3. Step 3: Cross multiply
   409,812x = 839,856 × 839,856
4. Step 4: Simplify right side
   409,812x = 705,358,100,736
5. Step 5: Solve for x
   x = 705,358,100,736/409,812
6. Step 6: Final answer
   x = 1,721,174.83