Finding the Third Proportional to 12,129.75 and 17,121.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,129.75 : 17,121.38 = 17,121.38 : x
2. Step 2: Convert to fraction form
   12,129.75/17,121.38 = 17,121.38/x
3. Step 3: Cross multiply
   12,129.75x = 17,121.38 × 17,121.38
4. Step 4: Simplify right side
   12,129.75x = 293,141,481.89
5. Step 5: Solve for x
   x = 293,141,481.89/12,129.75
6. Step 6: Final answer
   x = 24,167.15