Finding the Third Proportional to 399,499.50 and 855,861

Step by Step Solution

1. Step 1: Write the proportion equation
   399,499.50 : 855,861 = 855,861 : x
2. Step 2: Convert to fraction form
   399,499.50/855,861 = 855,861/x
3. Step 3: Cross multiply
   399,499.50x = 855,861 × 855,861
4. Step 4: Simplify right side
   399,499.50x = 732,498,051,321
5. Step 5: Solve for x
   x = 732,498,051,321/399,499.50
6. Step 6: Final answer
   x = 1,833,539.34