Finding the Fourth Proportional to 6,085.39, 8,397.90 and 3,989.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,085.39 : 8,397.90 = 3,989.50 : x
2. Step 2: Convert to fraction form
   6,085.39/8,397.90 = 3,989.50/x
3. Step 3: Cross multiply
   6,085.39x = 8,397.90 × 3,989.50
4. Step 4: Simplify right side
   6,085.39x = 33,503,422.05
5. Step 5: Solve for x
   x = 33,503,422.05/6,085.39
6. Step 6: Final answer
   x = 5,505.55