Finding the Fourth Proportional to 11,355.72, 17,041.32 and 3,960.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,355.72 : 17,041.32 = 3,960.12 : x
2. Step 2: Convert to fraction form
   11,355.72/17,041.32 = 3,960.12/x
3. Step 3: Cross multiply
   11,355.72x = 17,041.32 × 3,960.12
4. Step 4: Simplify right side
   11,355.72x = 67,485,672.16
5. Step 5: Solve for x
   x = 67,485,672.16/11,355.72
6. Step 6: Final answer
   x = 5,942.88