Finding the Fourth Proportional to 3,936.50, 5,912.84 and 3,805.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,936.50 : 5,912.84 = 3,805.28 : x
2. Step 2: Convert to fraction form
   3,936.50/5,912.84 = 3,805.28/x
3. Step 3: Cross multiply
   3,936.50x = 5,912.84 × 3,805.28
4. Step 4: Simplify right side
   3,936.50x = 22,500,011.80
5. Step 5: Solve for x
   x = 22,500,011.80/3,936.50
6. Step 6: Final answer
   x = 5,715.74