Finding the Fourth Proportional to 13,408.84, 18,503.31 and 7,440.13

Step by Step Solution

1. Step 1: Write the proportion equation
   13,408.84 : 18,503.31 = 7,440.13 : x
2. Step 2: Convert to fraction form
   13,408.84/18,503.31 = 7,440.13/x
3. Step 3: Cross multiply
   13,408.84x = 18,503.31 × 7,440.13
4. Step 4: Simplify right side
   13,408.84x = 137,667,031.83
5. Step 5: Solve for x
   x = 137,667,031.83/13,408.84
6. Step 6: Final answer
   x = 10,266.89