Finding the Third Proportional to 671,408 and 1,373,839

Step by Step Solution

1. Step 1: Write the proportion equation
   671,408 : 1,373,839 = 1,373,839 : x
2. Step 2: Convert to fraction form
   671,408/1,373,839 = 1,373,839/x
3. Step 3: Cross multiply
   671,408x = 1,373,839 × 1,373,839
4. Step 4: Simplify right side
   671,408x = 1,887,433,597,921
5. Step 5: Solve for x
   x = 1,887,433,597,921/671,408
6. Step 6: Final answer
   x = 2,811,157.45