Finding the Fourth Proportional to 3,405.20, 5,108.04 and 939.83

Step by Step Solution

1. Step 1: Write the proportion equation
   3,405.20 : 5,108.04 = 939.83 : x
2. Step 2: Convert to fraction form
   3,405.20/5,108.04 = 939.83/x
3. Step 3: Cross multiply
   3,405.20x = 5,108.04 × 939.83
4. Step 4: Simplify right side
   3,405.20x = 4,800,663.69
5. Step 5: Solve for x
   x = 4,800,663.69/3,405.20
6. Step 6: Final answer
   x = 1,409.81