Finding the Fourth Proportional to 21,818.07, 30,111.75 and 13,318.41

Step by Step Solution

1. Step 1: Write the proportion equation
   21,818.07 : 30,111.75 = 13,318.41 : x
2. Step 2: Convert to fraction form
   21,818.07/30,111.75 = 13,318.41/x
3. Step 3: Cross multiply
   21,818.07x = 30,111.75 × 13,318.41
4. Step 4: Simplify right side
   21,818.07x = 401,040,632.32
5. Step 5: Solve for x
   x = 401,040,632.32/21,818.07
6. Step 6: Final answer
   x = 18,381.12