Finding the Fourth Proportional to 8,665.53, 12,894.53 and 8,636.37

Step by Step Solution

1. Step 1: Write the proportion equation
   8,665.53 : 12,894.53 = 8,636.37 : x
2. Step 2: Convert to fraction form
   8,665.53/12,894.53 = 8,636.37/x
3. Step 3: Cross multiply
   8,665.53x = 12,894.53 × 8,636.37
4. Step 4: Simplify right side
   8,665.53x = 111,361,888.87
5. Step 5: Solve for x
   x = 111,361,888.87/8,665.53
6. Step 6: Final answer
   x = 12,851.13