Finding the Third Proportional to 8,309,516 and 12,431,056

Step by Step Solution

1. Step 1: Write the proportion equation
   8,309,516 : 12,431,056 = 12,431,056 : x
2. Step 2: Convert to fraction form
   8,309,516/12,431,056 = 12,431,056/x
3. Step 3: Cross multiply
   8,309,516x = 12,431,056 × 12,431,056
4. Step 4: Simplify right side
   8,309,516x = 154,531,153,275,136
5. Step 5: Solve for x
   x = 154,531,153,275,136/8,309,516
6. Step 6: Final answer
   x = 18,596,889.79