Finding the Fourth Proportional to 21,823.47, 30,098.12 and 13,425.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,823.47 : 30,098.12 = 13,425.39 : x
2. Step 2: Convert to fraction form
   21,823.47/30,098.12 = 13,425.39/x
3. Step 3: Cross multiply
   21,823.47x = 30,098.12 × 13,425.39
4. Step 4: Simplify right side
   21,823.47x = 404,078,932.14
5. Step 5: Solve for x
   x = 404,078,932.14/21,823.47
6. Step 6: Final answer
   x = 18,515.80