Finding the Fourth Proportional to 13,183.72, 19,778.46 and 3,949

Step by Step Solution

1. Step 1: Write the proportion equation
   13,183.72 : 19,778.46 = 3,949 : x
2. Step 2: Convert to fraction form
   13,183.72/19,778.46 = 3,949/x
3. Step 3: Cross multiply
   13,183.72x = 19,778.46 × 3,949
4. Step 4: Simplify right side
   13,183.72x = 78,105,138.54
5. Step 5: Solve for x
   x = 78,105,138.54/13,183.72
6. Step 6: Final answer
   x = 5,924.36