Finding the Fourth Proportional to 23,826.78, 32,880.90 and 13,218

Step by Step Solution

1. Step 1: Write the proportion equation
   23,826.78 : 32,880.90 = 13,218 : x
2. Step 2: Convert to fraction form
   23,826.78/32,880.90 = 13,218/x
3. Step 3: Cross multiply
   23,826.78x = 32,880.90 × 13,218
4. Step 4: Simplify right side
   23,826.78x = 434,619,736.20
5. Step 5: Solve for x
   x = 434,619,736.20/23,826.78
6. Step 6: Final answer
   x = 18,240.81