Finding the Third Proportional to 8,426,648 and 12,728,529

Step by Step Solution

1. Step 1: Write the proportion equation
   8,426,648 : 12,728,529 = 12,728,529 : x
2. Step 2: Convert to fraction form
   8,426,648/12,728,529 = 12,728,529/x
3. Step 3: Cross multiply
   8,426,648x = 12,728,529 × 12,728,529
4. Step 4: Simplify right side
   8,426,648x = 162,015,450,503,841
5. Step 5: Solve for x
   x = 162,015,450,503,841/8,426,648
6. Step 6: Final answer
   x = 19,226,559.66