Finding the Fourth Proportional to 8,260.58, 12,390.89 and 5,806.37

Step by Step Solution

1. Step 1: Write the proportion equation
   8,260.58 : 12,390.89 = 5,806.37 : x
2. Step 2: Convert to fraction form
   8,260.58/12,390.89 = 5,806.37/x
3. Step 3: Cross multiply
   8,260.58x = 12,390.89 × 5,806.37
4. Step 4: Simplify right side
   8,260.58x = 71,946,093.91
5. Step 5: Solve for x
   x = 71,946,093.91/8,260.58
6. Step 6: Final answer
   x = 8,709.57