Finding the Fourth Proportional to 13,099.72, 18,077.46 and 8,629.96

Step by Step Solution

1. Step 1: Write the proportion equation
   13,099.72 : 18,077.46 = 8,629.96 : x
2. Step 2: Convert to fraction form
   13,099.72/18,077.46 = 8,629.96/x
3. Step 3: Cross multiply
   13,099.72x = 18,077.46 × 8,629.96
4. Step 4: Simplify right side
   13,099.72x = 156,007,756.70
5. Step 5: Solve for x
   x = 156,007,756.70/13,099.72
6. Step 6: Final answer
   x = 11,909.24