Finding the Fourth Proportional to 3,939.54, 5,903.73 and 2,185.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,939.54 : 5,903.73 = 2,185.31 : x
2. Step 2: Convert to fraction form
   3,939.54/5,903.73 = 2,185.31/x
3. Step 3: Cross multiply
   3,939.54x = 5,903.73 × 2,185.31
4. Step 4: Simplify right side
   3,939.54x = 12,901,480.21
5. Step 5: Solve for x
   x = 12,901,480.21/3,939.54
6. Step 6: Final answer
   x = 3,274.87