Finding the Third Proportional to 3,931.88 and 8,589.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.88 : 8,589.38 = 8,589.38 : x
2. Step 2: Convert to fraction form
   3,931.88/8,589.38 = 8,589.38/x
3. Step 3: Cross multiply
   3,931.88x = 8,589.38 × 8,589.38
4. Step 4: Simplify right side
   3,931.88x = 73,777,362.89
5. Step 5: Solve for x
   x = 73,777,362.89/3,931.88
6. Step 6: Final answer
   x = 18,763.91