Finding the Fourth Proportional to 17,678.69, 24,396.53 and 9,720.89

Step by Step Solution

1. Step 1: Write the proportion equation
   17,678.69 : 24,396.53 = 9,720.89 : x
2. Step 2: Convert to fraction form
   17,678.69/24,396.53 = 9,720.89/x
3. Step 3: Cross multiply
   17,678.69x = 24,396.53 × 9,720.89
4. Step 4: Simplify right side
   17,678.69x = 237,155,813.92
5. Step 5: Solve for x
   x = 237,155,813.92/17,678.69
6. Step 6: Final answer
   x = 13,414.79