Finding the Third Proportional to 300,162 and 640,492

Step by Step Solution

1. Step 1: Write the proportion equation
   300,162 : 640,492 = 640,492 : x
2. Step 2: Convert to fraction form
   300,162/640,492 = 640,492/x
3. Step 3: Cross multiply
   300,162x = 640,492 × 640,492
4. Step 4: Simplify right side
   300,162x = 410,230,002,064
5. Step 5: Solve for x
   x = 410,230,002,064/300,162
6. Step 6: Final answer
   x = 1,366,695.32