Finding the Third Proportional to 8,309,579 and 12,431,167

Step by Step Solution

1. Step 1: Write the proportion equation
   8,309,579 : 12,431,167 = 12,431,167 : x
2. Step 2: Convert to fraction form
   8,309,579/12,431,167 = 12,431,167/x
3. Step 3: Cross multiply
   8,309,579x = 12,431,167 × 12,431,167
4. Step 4: Simplify right side
   8,309,579x = 154,533,912,981,889
5. Step 5: Solve for x
   x = 154,533,912,981,889/8,309,579
6. Step 6: Final answer
   x = 18,597,080.91