Finding the Fourth Proportional to 17,679.69, 24,397.90 and 9,721.89

Step by Step Solution

1. Step 1: Write the proportion equation
   17,679.69 : 24,397.90 = 9,721.89 : x
2. Step 2: Convert to fraction form
   17,679.69/24,397.90 = 9,721.89/x
3. Step 3: Cross multiply
   17,679.69x = 24,397.90 × 9,721.89
4. Step 4: Simplify right side
   17,679.69x = 237,193,700.03
5. Step 5: Solve for x
   x = 237,193,700.03/17,679.69
6. Step 6: Final answer
   x = 13,416.17