Finding the Fourth Proportional to 8,813.16, 12,129.12 and 8,105.22

Step by Step Solution

1. Step 1: Write the proportion equation
   8,813.16 : 12,129.12 = 8,105.22 : x
2. Step 2: Convert to fraction form
   8,813.16/12,129.12 = 8,105.22/x
3. Step 3: Cross multiply
   8,813.16x = 12,129.12 × 8,105.22
4. Step 4: Simplify right side
   8,813.16x = 98,309,186.01
5. Step 5: Solve for x
   x = 98,309,186.01/8,813.16
6. Step 6: Final answer
   x = 11,154.82