Finding the Third Proportional to 2,589,860 and 5,639,503

Step by Step Solution

1. Step 1: Write the proportion equation
   2,589,860 : 5,639,503 = 5,639,503 : x
2. Step 2: Convert to fraction form
   2,589,860/5,639,503 = 5,639,503/x
3. Step 3: Cross multiply
   2,589,860x = 5,639,503 × 5,639,503
4. Step 4: Simplify right side
   2,589,860x = 31,803,994,087,009
5. Step 5: Solve for x
   x = 31,803,994,087,009/2,589,860
6. Step 6: Final answer
   x = 12,280,198.19