Finding the Fourth Proportional to 3,960.72, 5,940.63 and 1,039.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,960.72 : 5,940.63 = 1,039.25 : x
2. Step 2: Convert to fraction form
   3,960.72/5,940.63 = 1,039.25/x
3. Step 3: Cross multiply
   3,960.72x = 5,940.63 × 1,039.25
4. Step 4: Simplify right side
   3,960.72x = 6,173,814.58
5. Step 5: Solve for x
   x = 6,173,814.58/3,960.72
6. Step 6: Final answer
   x = 1,558.76