Finding the Third Proportional to 2,556 and 5,590

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556 : 5,590 = 5,590 : x
2. Step 2: Convert to fraction form
   2,556/5,590 = 5,590/x
3. Step 3: Cross multiply
   2,556x = 5,590 × 5,590
4. Step 4: Simplify right side
   2,556x = 31,248,100
5. Step 5: Solve for x
   x = 31,248,100/2,556
6. Step 6: Final answer
   x = 12,225.39