Finding the Fourth Proportional to 10,979.60, 16,469.43 and 2,659.59

Step by Step Solution

1. Step 1: Write the proportion equation
   10,979.60 : 16,469.43 = 2,659.59 : x
2. Step 2: Convert to fraction form
   10,979.60/16,469.43 = 2,659.59/x
3. Step 3: Cross multiply
   10,979.60x = 16,469.43 × 2,659.59
4. Step 4: Simplify right side
   10,979.60x = 43,802,003.07
5. Step 5: Solve for x
   x = 43,802,003.07/10,979.60
6. Step 6: Final answer
   x = 3,989.40