Finding the Third Proportional to 8,378,630 and 12,811,443

Step by Step Solution

1. Step 1: Write the proportion equation
   8,378,630 : 12,811,443 = 12,811,443 : x
2. Step 2: Convert to fraction form
   8,378,630/12,811,443 = 12,811,443/x
3. Step 3: Cross multiply
   8,378,630x = 12,811,443 × 12,811,443
4. Step 4: Simplify right side
   8,378,630x = 164,133,071,742,249
5. Step 5: Solve for x
   x = 164,133,071,742,249/8,378,630
6. Step 6: Final answer
   x = 19,589,487.99