Finding the Fourth Proportional to 6,086.39, 8,399.28 and 3,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,086.39 : 8,399.28 = 3,990.50 : x
2. Step 2: Convert to fraction form
   6,086.39/8,399.28 = 3,990.50/x
3. Step 3: Cross multiply
   6,086.39x = 8,399.28 × 3,990.50
4. Step 4: Simplify right side
   6,086.39x = 33,517,326.84
5. Step 5: Solve for x
   x = 33,517,326.84/6,086.39
6. Step 6: Final answer
   x = 5,506.93