Finding the Fourth Proportional to 11,986.24, 17,981.38 and 3,664.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,986.24 : 17,981.38 = 3,664.31 : x
2. Step 2: Convert to fraction form
   11,986.24/17,981.38 = 3,664.31/x
3. Step 3: Cross multiply
   11,986.24x = 17,981.38 × 3,664.31
4. Step 4: Simplify right side
   11,986.24x = 65,889,332.23
5. Step 5: Solve for x
   x = 65,889,332.23/11,986.24
6. Step 6: Final answer
   x = 5,497.08