Finding the Third Proportional to 1,216,518 and 1,778,553

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216,518 : 1,778,553 = 1,778,553 : x
2. Step 2: Convert to fraction form
   1,216,518/1,778,553 = 1,778,553/x
3. Step 3: Cross multiply
   1,216,518x = 1,778,553 × 1,778,553
4. Step 4: Simplify right side
   1,216,518x = 3,163,250,773,809
5. Step 5: Solve for x
   x = 3,163,250,773,809/1,216,518
6. Step 6: Final answer
   x = 2,600,249.87