Finding the Fourth Proportional to 11,858.69, 17,786.01 and 3,960.11

Step by Step Solution

1. Step 1: Write the proportion equation
   11,858.69 : 17,786.01 = 3,960.11 : x
2. Step 2: Convert to fraction form
   11,858.69/17,786.01 = 3,960.11/x
3. Step 3: Cross multiply
   11,858.69x = 17,786.01 × 3,960.11
4. Step 4: Simplify right side
   11,858.69x = 70,434,556.06
5. Step 5: Solve for x
   x = 70,434,556.06/11,858.69
6. Step 6: Final answer
   x = 5,939.49