Finding the Third Proportional to 8,042,991 and 12,139,581

Step by Step Solution

1. Step 1: Write the proportion equation
   8,042,991 : 12,139,581 = 12,139,581 : x
2. Step 2: Convert to fraction form
   8,042,991/12,139,581 = 12,139,581/x
3. Step 3: Cross multiply
   8,042,991x = 12,139,581 × 12,139,581
4. Step 4: Simplify right side
   8,042,991x = 147,369,426,855,561
5. Step 5: Solve for x
   x = 147,369,426,855,561/8,042,991
6. Step 6: Final answer
   x = 18,322,714.38