Finding the Third Proportional to 439,864 and 613,870

Step by Step Solution

1. Step 1: Write the proportion equation
   439,864 : 613,870 = 613,870 : x
2. Step 2: Convert to fraction form
   439,864/613,870 = 613,870/x
3. Step 3: Cross multiply
   439,864x = 613,870 × 613,870
4. Step 4: Simplify right side
   439,864x = 376,836,376,900
5. Step 5: Solve for x
   x = 376,836,376,900/439,864
6. Step 6: Final answer
   x = 856,711.11