Finding the Fourth Proportional to 6,078.20, 8,390.72 and 3,559.96

Step by Step Solution

1. Step 1: Write the proportion equation
   6,078.20 : 8,390.72 = 3,559.96 : x
2. Step 2: Convert to fraction form
   6,078.20/8,390.72 = 3,559.96/x
3. Step 3: Cross multiply
   6,078.20x = 8,390.72 × 3,559.96
4. Step 4: Simplify right side
   6,078.20x = 29,870,609.77
5. Step 5: Solve for x
   x = 29,870,609.77/6,078.20
6. Step 6: Final answer
   x = 4,914.39