Finding the Fourth Proportional to 3,958.78, 5,459.48 and 3,399.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,958.78 : 5,459.48 = 3,399.06 : x
2. Step 2: Convert to fraction form
   3,958.78/5,459.48 = 3,399.06/x
3. Step 3: Cross multiply
   3,958.78x = 5,459.48 × 3,399.06
4. Step 4: Simplify right side
   3,958.78x = 18,557,100.09
5. Step 5: Solve for x
   x = 18,557,100.09/3,958.78
6. Step 6: Final answer
   x = 4,687.58