Finding the Third Proportional to 8,115.75 and 12,141.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,115.75 : 12,141.38 = 12,141.38 : x
2. Step 2: Convert to fraction form
   8,115.75/12,141.38 = 12,141.38/x
3. Step 3: Cross multiply
   8,115.75x = 12,141.38 × 12,141.38
4. Step 4: Simplify right side
   8,115.75x = 147,412,986.89
5. Step 5: Solve for x
   x = 147,412,986.89/8,115.75
6. Step 6: Final answer
   x = 18,163.82