Finding the Fourth Proportional to 3,979.81, 5,940.53 and 3,512.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,979.81 : 5,940.53 = 3,512.79 : x
2. Step 2: Convert to fraction form
   3,979.81/5,940.53 = 3,512.79/x
3. Step 3: Cross multiply
   3,979.81x = 5,940.53 × 3,512.79
4. Step 4: Simplify right side
   3,979.81x = 20,867,834.38
5. Step 5: Solve for x
   x = 20,867,834.38/3,979.81
6. Step 6: Final answer
   x = 5,243.42