Finding the Fourth Proportional to 13,408.65, 18,504.27 and 7,440.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,408.65 : 18,504.27 = 7,440.42 : x
2. Step 2: Convert to fraction form
   13,408.65/18,504.27 = 7,440.42/x
3. Step 3: Cross multiply
   13,408.65x = 18,504.27 × 7,440.42
4. Step 4: Simplify right side
   13,408.65x = 137,679,540.59
5. Step 5: Solve for x
   x = 137,679,540.59/13,408.65
6. Step 6: Final answer
   x = 10,267.96