Finding the Third Proportional to 8,579.25 and 12,891.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,579.25 : 12,891.38 = 12,891.38 : x
2. Step 2: Convert to fraction form
   8,579.25/12,891.38 = 12,891.38/x
3. Step 3: Cross multiply
   8,579.25x = 12,891.38 × 12,891.38
4. Step 4: Simplify right side
   8,579.25x = 166,187,549.39
5. Step 5: Solve for x
   x = 166,187,549.39/8,579.25
6. Step 6: Final answer
   x = 19,370.87