Finding the Third Proportional to 5,540.12 and 8,515.20

Step by Step Solution

1. Step 1: Write the proportion equation
   5,540.12 : 8,515.20 = 8,515.20 : x
2. Step 2: Convert to fraction form
   5,540.12/8,515.20 = 8,515.20/x
3. Step 3: Cross multiply
   5,540.12x = 8,515.20 × 8,515.20
4. Step 4: Simplify right side
   5,540.12x = 72,508,700.89
5. Step 5: Solve for x
   x = 72,508,700.89/5,540.12
6. Step 6: Final answer
   x = 13,087.94