Finding the Third Proportional to 308,162 and 640,516

Step by Step Solution

1. Step 1: Write the proportion equation
   308,162 : 640,516 = 640,516 : x
2. Step 2: Convert to fraction form
   308,162/640,516 = 640,516/x
3. Step 3: Cross multiply
   308,162x = 640,516 × 640,516
4. Step 4: Simplify right side
   308,162x = 410,260,746,256
5. Step 5: Solve for x
   x = 410,260,746,256/308,162
6. Step 6: Final answer
   x = 1,331,315.17