Finding the Fourth Proportional to 13,101.72, 18,080.22 and 8,631.96

Step by Step Solution

1. Step 1: Write the proportion equation
   13,101.72 : 18,080.22 = 8,631.96 : x
2. Step 2: Convert to fraction form
   13,101.72/18,080.22 = 8,631.96/x
3. Step 3: Cross multiply
   13,101.72x = 18,080.22 × 8,631.96
4. Step 4: Simplify right side
   13,101.72x = 156,067,735.83
5. Step 5: Solve for x
   x = 156,067,735.83/13,101.72
6. Step 6: Final answer
   x = 11,912.00