Finding the Fourth Proportional to 8,566.71, 12,856.55 and 3,639.81

Step by Step Solution

1. Step 1: Write the proportion equation
   8,566.71 : 12,856.55 = 3,639.81 : x
2. Step 2: Convert to fraction form
   8,566.71/12,856.55 = 3,639.81/x
3. Step 3: Cross multiply
   8,566.71x = 12,856.55 × 3,639.81
4. Step 4: Simplify right side
   8,566.71x = 46,795,381.06
5. Step 5: Solve for x
   x = 46,795,381.06/8,566.71
6. Step 6: Final answer
   x = 5,462.47