Finding the Third Proportional to 8,115.75 and 12,261.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,115.75 : 12,261.56 = 12,261.56 : x
2. Step 2: Convert to fraction form
   8,115.75/12,261.56 = 12,261.56/x
3. Step 3: Cross multiply
   8,115.75x = 12,261.56 × 12,261.56
4. Step 4: Simplify right side
   8,115.75x = 150,345,914.94
5. Step 5: Solve for x
   x = 150,345,914.94/8,115.75
6. Step 6: Final answer
   x = 18,525.20