Finding the Fourth Proportional to 13,839.69, 20,760.55 and 3,979.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,839.69 : 20,760.55 = 3,979.06 : x
2. Step 2: Convert to fraction form
   13,839.69/20,760.55 = 3,979.06/x
3. Step 3: Cross multiply
   13,839.69x = 20,760.55 × 3,979.06
4. Step 4: Simplify right side
   13,839.69x = 82,607,434.62
5. Step 5: Solve for x
   x = 82,607,434.62/13,839.69
6. Step 6: Final answer
   x = 5,968.88