Finding the Third Proportional to 8,461,490 and 12,890,631

Step by Step Solution

1. Step 1: Write the proportion equation
   8,461,490 : 12,890,631 = 12,890,631 : x
2. Step 2: Convert to fraction form
   8,461,490/12,890,631 = 12,890,631/x
3. Step 3: Cross multiply
   8,461,490x = 12,890,631 × 12,890,631
4. Step 4: Simplify right side
   8,461,490x = 166,168,367,578,161
5. Step 5: Solve for x
   x = 166,168,367,578,161/8,461,490
6. Step 6: Final answer
   x = 19,638,192.28