Finding the Fourth Proportional to 23,928.42, 33,020.88 and 13,318.05

Step by Step Solution

1. Step 1: Write the proportion equation
   23,928.42 : 33,020.88 = 13,318.05 : x
2. Step 2: Convert to fraction form
   23,928.42/33,020.88 = 13,318.05/x
3. Step 3: Cross multiply
   23,928.42x = 33,020.88 × 13,318.05
4. Step 4: Simplify right side
   23,928.42x = 439,773,730.88
5. Step 5: Solve for x
   x = 439,773,730.88/23,928.42
6. Step 6: Final answer
   x = 18,378.72