Finding the Third Proportional to 3,910.38 and 8,509.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,910.38 : 8,509.25 = 8,509.25 : x
2. Step 2: Convert to fraction form
   3,910.38/8,509.25 = 8,509.25/x
3. Step 3: Cross multiply
   3,910.38x = 8,509.25 × 8,509.25
4. Step 4: Simplify right side
   3,910.38x = 72,407,335.56
5. Step 5: Solve for x
   x = 72,407,335.56/3,910.38
6. Step 6: Final answer
   x = 18,516.72