Finding the Third Proportional to 2,580 and 5,460

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580 : 5,460 = 5,460 : x
2. Step 2: Convert to fraction form
   2,580/5,460 = 5,460/x
3. Step 3: Cross multiply
   2,580x = 5,460 × 5,460
4. Step 4: Simplify right side
   2,580x = 29,811,600
5. Step 5: Solve for x
   x = 29,811,600/2,580
6. Step 6: Final answer
   x = 11,554.88