Finding the Fourth Proportional to 13,489.56, 18,615.83 and 7,440.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,489.56 : 18,615.83 = 7,440.50 : x
2. Step 2: Convert to fraction form
   13,489.56/18,615.83 = 7,440.50/x
3. Step 3: Cross multiply
   13,489.56x = 18,615.83 × 7,440.50
4. Step 4: Simplify right side
   13,489.56x = 138,511,099.40
5. Step 5: Solve for x
   x = 138,511,099.40/13,489.56
6. Step 6: Final answer
   x = 10,268.02