Finding the Third Proportional to 2,590 and 5,611

Step by Step Solution

1. Step 1: Write the proportion equation
   2,590 : 5,611 = 5,611 : x
2. Step 2: Convert to fraction form
   2,590/5,611 = 5,611/x
3. Step 3: Cross multiply
   2,590x = 5,611 × 5,611
4. Step 4: Simplify right side
   2,590x = 31,483,321
5. Step 5: Solve for x
   x = 31,483,321/2,590
6. Step 6: Final answer
   x = 12,155.72