Finding the Fourth Proportional to 8,567.61, 12,848.18 and 3,639.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,567.61 : 12,848.18 = 3,639.57 : x
2. Step 2: Convert to fraction form
   8,567.61/12,848.18 = 3,639.57/x
3. Step 3: Cross multiply
   8,567.61x = 12,848.18 × 3,639.57
4. Step 4: Simplify right side
   8,567.61x = 46,761,832.28
5. Step 5: Solve for x
   x = 46,761,832.28/8,567.61
6. Step 6: Final answer
   x = 5,457.98