Finding the Third Proportional to 8,426,628 and 12,728,498

Step by Step Solution

1. Step 1: Write the proportion equation
   8,426,628 : 12,728,498 = 12,728,498 : x
2. Step 2: Convert to fraction form
   8,426,628/12,728,498 = 12,728,498/x
3. Step 3: Cross multiply
   8,426,628x = 12,728,498 × 12,728,498
4. Step 4: Simplify right side
   8,426,628x = 162,014,661,336,004
5. Step 5: Solve for x
   x = 162,014,661,336,004/8,426,628
6. Step 6: Final answer
   x = 19,226,511.64