Finding the Third Proportional to 807,638 and 1,267,123

Step by Step Solution

1. Step 1: Write the proportion equation
   807,638 : 1,267,123 = 1,267,123 : x
2. Step 2: Convert to fraction form
   807,638/1,267,123 = 1,267,123/x
3. Step 3: Cross multiply
   807,638x = 1,267,123 × 1,267,123
4. Step 4: Simplify right side
   807,638x = 1,605,600,697,129
5. Step 5: Solve for x
   x = 1,605,600,697,129/807,638
6. Step 6: Final answer
   x = 1,988,020.25