Finding the Fourth Proportional to 21,406.24, 29,540.88 and 13,343.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,406.24 : 29,540.88 = 13,343.15 : x
2. Step 2: Convert to fraction form
   21,406.24/29,540.88 = 13,343.15/x
3. Step 3: Cross multiply
   21,406.24x = 29,540.88 × 13,343.15
4. Step 4: Simplify right side
   21,406.24x = 394,168,466.82
5. Step 5: Solve for x
   x = 394,168,466.82/21,406.24
6. Step 6: Final answer
   x = 18,413.72