Finding the Fourth Proportional to 3,930.37, 5,423.82 and 2,161.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,930.37 : 5,423.82 = 2,161.96 : x
2. Step 2: Convert to fraction form
   3,930.37/5,423.82 = 2,161.96/x
3. Step 3: Cross multiply
   3,930.37x = 5,423.82 × 2,161.96
4. Step 4: Simplify right side
   3,930.37x = 11,726,081.89
5. Step 5: Solve for x
   x = 11,726,081.89/3,930.37
6. Step 6: Final answer
   x = 2,983.45