Finding the Fourth Proportional to 3,878.33, 5,355.89 and 3,315.53

Step by Step Solution

1. Step 1: Write the proportion equation
   3,878.33 : 5,355.89 = 3,315.53 : x
2. Step 2: Convert to fraction form
   3,878.33/5,355.89 = 3,315.53/x
3. Step 3: Cross multiply
   3,878.33x = 5,355.89 × 3,315.53
4. Step 4: Simplify right side
   3,878.33x = 17,757,610.78
5. Step 5: Solve for x
   x = 17,757,610.78/3,878.33
6. Step 6: Final answer
   x = 4,578.67