Finding the Fourth Proportional to 8,636.94, 12,958.18 and 3,086.52

Step by Step Solution

1. Step 1: Write the proportion equation
   8,636.94 : 12,958.18 = 3,086.52 : x
2. Step 2: Convert to fraction form
   8,636.94/12,958.18 = 3,086.52/x
3. Step 3: Cross multiply
   8,636.94x = 12,958.18 × 3,086.52
4. Step 4: Simplify right side
   8,636.94x = 39,995,681.73
5. Step 5: Solve for x
   x = 39,995,681.73/8,636.94
6. Step 6: Final answer
   x = 4,630.77