Finding the Fourth Proportional to 13,119.77, 18,105.05 and 7,151.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,119.77 : 18,105.05 = 7,151.48 : x
2. Step 2: Convert to fraction form
   13,119.77/18,105.05 = 7,151.48/x
3. Step 3: Cross multiply
   13,119.77x = 18,105.05 × 7,151.48
4. Step 4: Simplify right side
   13,119.77x = 129,477,776.69
5. Step 5: Solve for x
   x = 129,477,776.69/13,119.77
6. Step 6: Final answer
   x = 9,868.91