Finding the Fourth Proportional to 8,636.10, 12,960.72 and 5,856.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,636.10 : 12,960.72 = 5,856.18 : x
2. Step 2: Convert to fraction form
   8,636.10/12,960.72 = 5,856.18/x
3. Step 3: Cross multiply
   8,636.10x = 12,960.72 × 5,856.18
4. Step 4: Simplify right side
   8,636.10x = 75,900,309.25
5. Step 5: Solve for x
   x = 75,900,309.25/8,636.10
6. Step 6: Final answer
   x = 8,788.73