Finding the Fourth Proportional to 13,218.54, 18,231.39 and 7,906.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,218.54 : 18,231.39 = 7,906.56 : x
2. Step 2: Convert to fraction form
   13,218.54/18,231.39 = 7,906.56/x
3. Step 3: Cross multiply
   13,218.54x = 18,231.39 × 7,906.56
4. Step 4: Simplify right side
   13,218.54x = 144,147,578.92
5. Step 5: Solve for x
   x = 144,147,578.92/13,218.54
6. Step 6: Final answer
   x = 10,904.95