Finding the Fourth Proportional to 8,856.83, 13,180.69 and 8,561.54

Step by Step Solution

1. Step 1: Write the proportion equation
   8,856.83 : 13,180.69 = 8,561.54 : x
2. Step 2: Convert to fraction form
   8,856.83/13,180.69 = 8,561.54/x
3. Step 3: Cross multiply
   8,856.83x = 13,180.69 × 8,561.54
4. Step 4: Simplify right side
   8,856.83x = 112,847,004.66
5. Step 5: Solve for x
   x = 112,847,004.66/8,856.83
6. Step 6: Final answer
   x = 12,741.24