Finding the Third Proportional to 308,164.50 and 640,521

Step by Step Solution

1. Step 1: Write the proportion equation
   308,164.50 : 640,521 = 640,521 : x
2. Step 2: Convert to fraction form
   308,164.50/640,521 = 640,521/x
3. Step 3: Cross multiply
   308,164.50x = 640,521 × 640,521
4. Step 4: Simplify right side
   308,164.50x = 410,267,151,441
5. Step 5: Solve for x
   x = 410,267,151,441/308,164.50
6. Step 6: Final answer
   x = 1,331,325.16