Finding the Third Proportional to 8,461,510 and 12,890,661

Step by Step Solution

1. Step 1: Write the proportion equation
   8,461,510 : 12,890,661 = 12,890,661 : x
2. Step 2: Convert to fraction form
   8,461,510/12,890,661 = 12,890,661/x
3. Step 3: Cross multiply
   8,461,510x = 12,890,661 × 12,890,661
4. Step 4: Simplify right side
   8,461,510x = 166,169,141,016,921
5. Step 5: Solve for x
   x = 166,169,141,016,921/8,461,510
6. Step 6: Final answer
   x = 19,638,237.27