Finding the Fourth Proportional to 13,406.50, 18,503.18 and 7,440.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,406.50 : 18,503.18 = 7,440.09 : x
2. Step 2: Convert to fraction form
   13,406.50/18,503.18 = 7,440.09/x
3. Step 3: Cross multiply
   13,406.50x = 18,503.18 × 7,440.09
4. Step 4: Simplify right side
   13,406.50x = 137,665,324.49
5. Step 5: Solve for x
   x = 137,665,324.49/13,406.50
6. Step 6: Final answer
   x = 10,268.55