Finding the Third Proportional to 581,638 and 1,216,249

Step by Step Solution

1. Step 1: Write the proportion equation
   581,638 : 1,216,249 = 1,216,249 : x
2. Step 2: Convert to fraction form
   581,638/1,216,249 = 1,216,249/x
3. Step 3: Cross multiply
   581,638x = 1,216,249 × 1,216,249
4. Step 4: Simplify right side
   581,638x = 1,479,261,630,001
5. Step 5: Solve for x
   x = 1,479,261,630,001/581,638
6. Step 6: Final answer
   x = 2,543,268.55