Finding the Third Proportional to 297,008 and 639,976

Step by Step Solution

1. Step 1: Write the proportion equation
   297,008 : 639,976 = 639,976 : x
2. Step 2: Convert to fraction form
   297,008/639,976 = 639,976/x
3. Step 3: Cross multiply
   297,008x = 639,976 × 639,976
4. Step 4: Simplify right side
   297,008x = 409,569,280,576
5. Step 5: Solve for x
   x = 409,569,280,576/297,008
6. Step 6: Final answer
   x = 1,378,984.00