Finding the Third Proportional to 120,865,721 and 258,961,682

Step by Step Solution

1. Step 1: Write the proportion equation
   120,865,721 : 258,961,682 = 258,961,682 : x
2. Step 2: Convert to fraction form
   120,865,721/258,961,682 = 258,961,682/x
3. Step 3: Cross multiply
   120,865,721x = 258,961,682 × 258,961,682
4. Step 4: Simplify right side
   120,865,721x = 67,061,152,744,269,120
5. Step 5: Solve for x
   x = 67,061,152,744,269,120/120,865,721
6. Step 6: Final answer
   x = 554,840,133.24