Finding the Fourth Proportional to 21,810.12, 30,098.16 and 13,425

Step by Step Solution

1. Step 1: Write the proportion equation
   21,810.12 : 30,098.16 = 13,425 : x
2. Step 2: Convert to fraction form
   21,810.12/30,098.16 = 13,425/x
3. Step 3: Cross multiply
   21,810.12x = 30,098.16 × 13,425
4. Step 4: Simplify right side
   21,810.12x = 404,067,798
5. Step 5: Solve for x
   x = 404,067,798/21,810.12
6. Step 6: Final answer
   x = 18,526.62