Finding the Fourth Proportional to 3,935.76, 5,396.16 and 3,865.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,935.76 : 5,396.16 = 3,865.56 : x
2. Step 2: Convert to fraction form
   3,935.76/5,396.16 = 3,865.56/x
3. Step 3: Cross multiply
   3,935.76x = 5,396.16 × 3,865.56
4. Step 4: Simplify right side
   3,935.76x = 20,859,180.25
5. Step 5: Solve for x
   x = 20,859,180.25/3,935.76
6. Step 6: Final answer
   x = 5,299.91