Finding the Fourth Proportional to 3,934.34, 5,429.39 and 2,165.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,934.34 : 5,429.39 = 2,165.91 : x
2. Step 2: Convert to fraction form
   3,934.34/5,429.39 = 2,165.91/x
3. Step 3: Cross multiply
   3,934.34x = 5,429.39 × 2,165.91
4. Step 4: Simplify right side
   3,934.34x = 11,759,559.27
5. Step 5: Solve for x
   x = 11,759,559.27/3,934.34
6. Step 6: Final answer
   x = 2,988.96