Finding the Third Proportional to 8,419,854 and 12,705,564

Step by Step Solution

1. Step 1: Write the proportion equation
   8,419,854 : 12,705,564 = 12,705,564 : x
2. Step 2: Convert to fraction form
   8,419,854/12,705,564 = 12,705,564/x
3. Step 3: Cross multiply
   8,419,854x = 12,705,564 × 12,705,564
4. Step 4: Simplify right side
   8,419,854x = 161,431,356,558,096
5. Step 5: Solve for x
   x = 161,431,356,558,096/8,419,854
6. Step 6: Final answer
   x = 19,172,702.59