Finding the Fourth Proportional to 21,896.89, 30,208.11 and 13,399.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,896.89 : 30,208.11 = 13,399.42 : x
2. Step 2: Convert to fraction form
   21,896.89/30,208.11 = 13,399.42/x
3. Step 3: Cross multiply
   21,896.89x = 30,208.11 × 13,399.42
4. Step 4: Simplify right side
   21,896.89x = 404,771,153.30
5. Step 5: Solve for x
   x = 404,771,153.30/21,896.89
6. Step 6: Final answer
   x = 18,485.33