Finding the Fourth Proportional to 11,729.72, 17,596.20 and 3,940.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,729.72 : 17,596.20 = 3,940.76 : x
2. Step 2: Convert to fraction form
   11,729.72/17,596.20 = 3,940.76/x
3. Step 3: Cross multiply
   11,729.72x = 17,596.20 × 3,940.76
4. Step 4: Simplify right side
   11,729.72x = 69,342,401.11
5. Step 5: Solve for x
   x = 69,342,401.11/11,729.72
6. Step 6: Final answer
   x = 5,911.68