Finding the Fourth Proportional to 11,839.28, 17,756.67 and 3,940.61

Step by Step Solution

1. Step 1: Write the proportion equation
   11,839.28 : 17,756.67 = 3,940.61 : x
2. Step 2: Convert to fraction form
   11,839.28/17,756.67 = 3,940.61/x
3. Step 3: Cross multiply
   11,839.28x = 17,756.67 × 3,940.61
4. Step 4: Simplify right side
   11,839.28x = 69,972,111.37
5. Step 5: Solve for x
   x = 69,972,111.37/11,839.28
6. Step 6: Final answer
   x = 5,910.17