Finding the Third Proportional to 638,503 and 1,396,670

Step by Step Solution

1. Step 1: Write the proportion equation
   638,503 : 1,396,670 = 1,396,670 : x
2. Step 2: Convert to fraction form
   638,503/1,396,670 = 1,396,670/x
3. Step 3: Cross multiply
   638,503x = 1,396,670 × 1,396,670
4. Step 4: Simplify right side
   638,503x = 1,950,687,088,900
5. Step 5: Solve for x
   x = 1,950,687,088,900/638,503
6. Step 6: Final answer
   x = 3,055,094.63