Finding the Third Proportional to 638,871 and 1,366,386

Step by Step Solution

1. Step 1: Write the proportion equation
   638,871 : 1,366,386 = 1,366,386 : x
2. Step 2: Convert to fraction form
   638,871/1,366,386 = 1,366,386/x
3. Step 3: Cross multiply
   638,871x = 1,366,386 × 1,366,386
4. Step 4: Simplify right side
   638,871x = 1,867,010,700,996
5. Step 5: Solve for x
   x = 1,867,010,700,996/638,871
6. Step 6: Final answer
   x = 2,922,359.45