Finding the Fourth Proportional to 8,260.58, 12,379.94 and 3,870.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,260.58 : 12,379.94 = 3,870.18 : x
2. Step 2: Convert to fraction form
   8,260.58/12,379.94 = 3,870.18/x
3. Step 3: Cross multiply
   8,260.58x = 12,379.94 × 3,870.18
4. Step 4: Simplify right side
   8,260.58x = 47,912,591.35
5. Step 5: Solve for x
   x = 47,912,591.35/8,260.58
6. Step 6: Final answer
   x = 5,800.15