Finding the Third Proportional to 297,922 and 645,872

Step by Step Solution

1. Step 1: Write the proportion equation
   297,922 : 645,872 = 645,872 : x
2. Step 2: Convert to fraction form
   297,922/645,872 = 645,872/x
3. Step 3: Cross multiply
   297,922x = 645,872 × 645,872
4. Step 4: Simplify right side
   297,922x = 417,150,640,384
5. Step 5: Solve for x
   x = 417,150,640,384/297,922
6. Step 6: Final answer
   x = 1,400,200.86