Finding the Fourth Proportional to 8,570.13, 12,857.09 and 3,643.98

Step by Step Solution

1. Step 1: Write the proportion equation
   8,570.13 : 12,857.09 = 3,643.98 : x
2. Step 2: Convert to fraction form
   8,570.13/12,857.09 = 3,643.98/x
3. Step 3: Cross multiply
   8,570.13x = 12,857.09 × 3,643.98
4. Step 4: Simplify right side
   8,570.13x = 46,850,978.82
5. Step 5: Solve for x
   x = 46,850,978.82/8,570.13
6. Step 6: Final answer
   x = 5,466.78