Finding the Fourth Proportional to 13,176.77, 18,185.57 and 8,709.81

Step by Step Solution

1. Step 1: Write the proportion equation
   13,176.77 : 18,185.57 = 8,709.81 : x
2. Step 2: Convert to fraction form
   13,176.77/18,185.57 = 8,709.81/x
3. Step 3: Cross multiply
   13,176.77x = 18,185.57 × 8,709.81
4. Step 4: Simplify right side
   13,176.77x = 158,392,815.89
5. Step 5: Solve for x
   x = 158,392,815.89/13,176.77
6. Step 6: Final answer
   x = 12,020.61