Finding the Fourth Proportional to 21,960.72, 30,306.24 and 13,008.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,960.72 : 30,306.24 = 13,008.06 : x
2. Step 2: Convert to fraction form
   21,960.72/30,306.24 = 13,008.06/x
3. Step 3: Cross multiply
   21,960.72x = 30,306.24 × 13,008.06
4. Step 4: Simplify right side
   21,960.72x = 394,225,388.29
5. Step 5: Solve for x
   x = 394,225,388.29/21,960.72
6. Step 6: Final answer
   x = 17,951.39