Finding the Third Proportional to 4,067.72 and 8,712.56

Step by Step Solution

1. Step 1: Write the proportion equation
   4,067.72 : 8,712.56 = 8,712.56 : x
2. Step 2: Convert to fraction form
   4,067.72/8,712.56 = 8,712.56/x
3. Step 3: Cross multiply
   4,067.72x = 8,712.56 × 8,712.56
4. Step 4: Simplify right side
   4,067.72x = 75,908,745.32
5. Step 5: Solve for x
   x = 75,908,745.32/4,067.72
6. Step 6: Final answer
   x = 18,661.26