Finding the Fourth Proportional to 3,959.72, 5,946.38 and 3,515.99

Step by Step Solution

1. Step 1: Write the proportion equation
   3,959.72 : 5,946.38 = 3,515.99 : x
2. Step 2: Convert to fraction form
   3,959.72/5,946.38 = 3,515.99/x
3. Step 3: Cross multiply
   3,959.72x = 5,946.38 × 3,515.99
4. Step 4: Simplify right side
   3,959.72x = 20,907,412.62
5. Step 5: Solve for x
   x = 20,907,412.62/3,959.72
6. Step 6: Final answer
   x = 5,280.02