Finding the Third Proportional to 297,892 and 638,426

Step by Step Solution

1. Step 1: Write the proportion equation
   297,892 : 638,426 = 638,426 : x
2. Step 2: Convert to fraction form
   297,892/638,426 = 638,426/x
3. Step 3: Cross multiply
   297,892x = 638,426 × 638,426
4. Step 4: Simplify right side
   297,892x = 407,587,757,476
5. Step 5: Solve for x
   x = 407,587,757,476/297,892
6. Step 6: Final answer
   x = 1,368,240.02