Finding the Third Proportional to 1,209,408 and 2,639,856

Step by Step Solution

1. Step 1: Write the proportion equation
   1,209,408 : 2,639,856 = 2,639,856 : x
2. Step 2: Convert to fraction form
   1,209,408/2,639,856 = 2,639,856/x
3. Step 3: Cross multiply
   1,209,408x = 2,639,856 × 2,639,856
4. Step 4: Simplify right side
   1,209,408x = 6,968,839,700,736
5. Step 5: Solve for x
   x = 6,968,839,700,736/1,209,408
6. Step 6: Final answer
   x = 5,762,190.84