Finding the Third Proportional to 8,309,306 and 12,988,839

Step by Step Solution

1. Step 1: Write the proportion equation
   8,309,306 : 12,988,839 = 12,988,839 : x
2. Step 2: Convert to fraction form
   8,309,306/12,988,839 = 12,988,839/x
3. Step 3: Cross multiply
   8,309,306x = 12,988,839 × 12,988,839
4. Step 4: Simplify right side
   8,309,306x = 168,709,938,567,921
5. Step 5: Solve for x
   x = 168,709,938,567,921/8,309,306
6. Step 6: Final answer
   x = 20,303,733.98