Finding the Third Proportional to 399,500 and 855,860

Step by Step Solution

1. Step 1: Write the proportion equation
   399,500 : 855,860 = 855,860 : x
2. Step 2: Convert to fraction form
   399,500/855,860 = 855,860/x
3. Step 3: Cross multiply
   399,500x = 855,860 × 855,860
4. Step 4: Simplify right side
   399,500x = 732,496,339,600
5. Step 5: Solve for x
   x = 732,496,339,600/399,500
6. Step 6: Final answer
   x = 1,833,532.76