Finding the Third Proportional to 296,314 and 638,960

Step by Step Solution

1. Step 1: Write the proportion equation
   296,314 : 638,960 = 638,960 : x
2. Step 2: Convert to fraction form
   296,314/638,960 = 638,960/x
3. Step 3: Cross multiply
   296,314x = 638,960 × 638,960
4. Step 4: Simplify right side
   296,314x = 408,269,881,600
5. Step 5: Solve for x
   x = 408,269,881,600/296,314
6. Step 6: Final answer
   x = 1,377,828.53