Finding the Fourth Proportional to 8,257.91, 12,386.72 and 5,722.65

Step by Step Solution

1. Step 1: Write the proportion equation
   8,257.91 : 12,386.72 = 5,722.65 : x
2. Step 2: Convert to fraction form
   8,257.91/12,386.72 = 5,722.65/x
3. Step 3: Cross multiply
   8,257.91x = 12,386.72 × 5,722.65
4. Step 4: Simplify right side
   8,257.91x = 70,884,834.59
5. Step 5: Solve for x
   x = 70,884,834.59/8,257.91
6. Step 6: Final answer
   x = 8,583.88