Finding the Third Proportional to 2,556.56 and 3,910.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.56 : 3,910.78 = 3,910.78 : x
2. Step 2: Convert to fraction form
   2,556.56/3,910.78 = 3,910.78/x
3. Step 3: Cross multiply
   2,556.56x = 3,910.78 × 3,910.78
4. Step 4: Simplify right side
   2,556.56x = 15,294,209.99
5. Step 5: Solve for x
   x = 15,294,209.99/2,556.56
6. Step 6: Final answer
   x = 5,982.33