Finding the Third Proportional to 2,558 and 5,591

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558 : 5,591 = 5,591 : x
2. Step 2: Convert to fraction form
   2,558/5,591 = 5,591/x
3. Step 3: Cross multiply
   2,558x = 5,591 × 5,591
4. Step 4: Simplify right side
   2,558x = 31,259,281
5. Step 5: Solve for x
   x = 31,259,281/2,558
6. Step 6: Final answer
   x = 12,220.20