Finding the Fourth Proportional to 17,028.72, 23,499.20 and 9,857.64

Step by Step Solution

1. Step 1: Write the proportion equation
   17,028.72 : 23,499.20 = 9,857.64 : x
2. Step 2: Convert to fraction form
   17,028.72/23,499.20 = 9,857.64/x
3. Step 3: Cross multiply
   17,028.72x = 23,499.20 × 9,857.64
4. Step 4: Simplify right side
   17,028.72x = 231,646,653.89
5. Step 5: Solve for x
   x = 231,646,653.89/17,028.72
6. Step 6: Final answer
   x = 13,603.29