Finding the Third Proportional to 8,478.25 and 13,143.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,478.25 : 13,143.38 = 13,143.38 : x
2. Step 2: Convert to fraction form
   8,478.25/13,143.38 = 13,143.38/x
3. Step 3: Cross multiply
   8,478.25x = 13,143.38 × 13,143.38
4. Step 4: Simplify right side
   8,478.25x = 172,748,306.39
5. Step 5: Solve for x
   x = 172,748,306.39/8,478.25
6. Step 6: Final answer
   x = 20,375.47