Finding the Fourth Proportional to 17,678.34, 24,396.57 and 9,721.08

Step by Step Solution

1. Step 1: Write the proportion equation
   17,678.34 : 24,396.57 = 9,721.08 : x
2. Step 2: Convert to fraction form
   17,678.34/24,396.57 = 9,721.08/x
3. Step 3: Cross multiply
   17,678.34x = 24,396.57 × 9,721.08
4. Step 4: Simplify right side
   17,678.34x = 237,161,008.70
5. Step 5: Solve for x
   x = 237,161,008.70/17,678.34
6. Step 6: Final answer
   x = 13,415.34