Finding the Fourth Proportional to 21,815.07, 30,103.98 and 13,331.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,815.07 : 30,103.98 = 13,331.39 : x
2. Step 2: Convert to fraction form
   21,815.07/30,103.98 = 13,331.39/x
3. Step 3: Cross multiply
   21,815.07x = 30,103.98 × 13,331.39
4. Step 4: Simplify right side
   21,815.07x = 401,327,747.41
5. Step 5: Solve for x
   x = 401,327,747.41/21,815.07
6. Step 6: Final answer
   x = 18,396.81