Finding the Fourth Proportional to 3,929.98, 5,423.52 and 2,161.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,929.98 : 5,423.52 = 2,161.54 : x
2. Step 2: Convert to fraction form
   3,929.98/5,423.52 = 2,161.54/x
3. Step 3: Cross multiply
   3,929.98x = 5,423.52 × 2,161.54
4. Step 4: Simplify right side
   3,929.98x = 11,723,155.42
5. Step 5: Solve for x
   x = 11,723,155.42/3,929.98
6. Step 6: Final answer
   x = 2,983.01