Finding the Third Proportional to 5,580 and 10,860

Step by Step Solution

1. Step 1: Write the proportion equation
   5,580 : 10,860 = 10,860 : x
2. Step 2: Convert to fraction form
   5,580/10,860 = 10,860/x
3. Step 3: Cross multiply
   5,580x = 10,860 × 10,860
4. Step 4: Simplify right side
   5,580x = 117,939,600
5. Step 5: Solve for x
   x = 117,939,600/5,580
6. Step 6: Final answer
   x = 21,136.13