Finding the Third Proportional to 399,144 and 853,632

Step by Step Solution

1. Step 1: Write the proportion equation
   399,144 : 853,632 = 853,632 : x
2. Step 2: Convert to fraction form
   399,144/853,632 = 853,632/x
3. Step 3: Cross multiply
   399,144x = 853,632 × 853,632
4. Step 4: Simplify right side
   399,144x = 728,687,591,424
5. Step 5: Solve for x
   x = 728,687,591,424/399,144
6. Step 6: Final answer
   x = 1,825,625.82