Finding the Fourth Proportional to 3,990.42, 5,986.89 and 3,576.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.42 : 5,986.89 = 3,576.96 : x
2. Step 2: Convert to fraction form
   3,990.42/5,986.89 = 3,576.96/x
3. Step 3: Cross multiply
   3,990.42x = 5,986.89 × 3,576.96
4. Step 4: Simplify right side
   3,990.42x = 21,414,866.05
5. Step 5: Solve for x
   x = 21,414,866.05/3,990.42
6. Step 6: Final answer
   x = 5,366.57