Finding the Third Proportional to 321,942 and 699,287

Step by Step Solution

1. Step 1: Write the proportion equation
   321,942 : 699,287 = 699,287 : x
2. Step 2: Convert to fraction form
   321,942/699,287 = 699,287/x
3. Step 3: Cross multiply
   321,942x = 699,287 × 699,287
4. Step 4: Simplify right side
   321,942x = 489,002,308,369
5. Step 5: Solve for x
   x = 489,002,308,369/321,942
6. Step 6: Final answer
   x = 1,518,914.30