Finding the Third Proportional to 4,067.72 and 8,684.72

Step by Step Solution

1. Step 1: Write the proportion equation
   4,067.72 : 8,684.72 = 8,684.72 : x
2. Step 2: Convert to fraction form
   4,067.72/8,684.72 = 8,684.72/x
3. Step 3: Cross multiply
   4,067.72x = 8,684.72 × 8,684.72
4. Step 4: Simplify right side
   4,067.72x = 75,424,339.77
5. Step 5: Solve for x
   x = 75,424,339.77/4,067.72
6. Step 6: Final answer
   x = 18,542.17