Finding the Fourth Proportional to 3,935.60, 5,872.56 and 3,521.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,935.60 : 5,872.56 = 3,521.89 : x
2. Step 2: Convert to fraction form
   3,935.60/5,872.56 = 3,521.89/x
3. Step 3: Cross multiply
   3,935.60x = 5,872.56 × 3,521.89
4. Step 4: Simplify right side
   3,935.60x = 20,682,505.29
5. Step 5: Solve for x
   x = 20,682,505.29/3,935.60
6. Step 6: Final answer
   x = 5,255.24