Finding the Fourth Proportional to 11,979.16, 17,969.67 and 3,659.23

Step by Step Solution

1. Step 1: Write the proportion equation
   11,979.16 : 17,969.67 = 3,659.23 : x
2. Step 2: Convert to fraction form
   11,979.16/17,969.67 = 3,659.23/x
3. Step 3: Cross multiply
   11,979.16x = 17,969.67 × 3,659.23
4. Step 4: Simplify right side
   11,979.16x = 65,755,155.55
5. Step 5: Solve for x
   x = 65,755,155.55/11,979.16
6. Step 6: Final answer
   x = 5,489.13