Finding the Fourth Proportional to 3,935.98, 5,429.58 and 2,591.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,935.98 : 5,429.58 = 2,591.38 : x
2. Step 2: Convert to fraction form
   3,935.98/5,429.58 = 2,591.38/x
3. Step 3: Cross multiply
   3,935.98x = 5,429.58 × 2,591.38
4. Step 4: Simplify right side
   3,935.98x = 14,070,105.02
5. Step 5: Solve for x
   x = 14,070,105.02/3,935.98
6. Step 6: Final answer
   x = 3,574.74