Finding the Fourth Proportional to 13,120.27, 18,105.73 and 7,151.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.27 : 18,105.73 = 7,151.98 : x
2. Step 2: Convert to fraction form
   13,120.27/18,105.73 = 7,151.98/x
3. Step 3: Cross multiply
   13,120.27x = 18,105.73 × 7,151.98
4. Step 4: Simplify right side
   13,120.27x = 129,491,818.85
5. Step 5: Solve for x
   x = 129,491,818.85/13,120.27
6. Step 6: Final answer
   x = 9,869.60