Finding the Third Proportional to 8,309,836 and 12,519,430

Step by Step Solution

1. Step 1: Write the proportion equation
   8,309,836 : 12,519,430 = 12,519,430 : x
2. Step 2: Convert to fraction form
   8,309,836/12,519,430 = 12,519,430/x
3. Step 3: Cross multiply
   8,309,836x = 12,519,430 × 12,519,430
4. Step 4: Simplify right side
   8,309,836x = 156,736,127,524,900
5. Step 5: Solve for x
   x = 156,736,127,524,900/8,309,836
6. Step 6: Final answer
   x = 18,861,518.75