Finding the Third Proportional to 720,418 and 1,667,638

Step by Step Solution

1. Step 1: Write the proportion equation
   720,418 : 1,667,638 = 1,667,638 : x
2. Step 2: Convert to fraction form
   720,418/1,667,638 = 1,667,638/x
3. Step 3: Cross multiply
   720,418x = 1,667,638 × 1,667,638
4. Step 4: Simplify right side
   720,418x = 2,781,016,499,044
5. Step 5: Solve for x
   x = 2,781,016,499,044/720,418
6. Step 6: Final answer
   x = 3,860,281.81