Finding the Third Proportional to 12,171.38 and 18,388.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,171.38 : 18,388.69 = 18,388.69 : x
2. Step 2: Convert to fraction form
   12,171.38/18,388.69 = 18,388.69/x
3. Step 3: Cross multiply
   12,171.38x = 18,388.69 × 18,388.69
4. Step 4: Simplify right side
   12,171.38x = 338,143,827.97
5. Step 5: Solve for x
   x = 338,143,827.97/12,171.38
6. Step 6: Final answer
   x = 27,781.89