Finding the Third Proportional to 2,558,578 and 5,515,716

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558,578 : 5,515,716 = 5,515,716 : x
2. Step 2: Convert to fraction form
   2,558,578/5,515,716 = 5,515,716/x
3. Step 3: Cross multiply
   2,558,578x = 5,515,716 × 5,515,716
4. Step 4: Simplify right side
   2,558,578x = 30,423,122,992,656
5. Step 5: Solve for x
   x = 30,423,122,992,656/2,558,578
6. Step 6: Final answer
   x = 11,890,637.30