Finding the Fourth Proportional to 13,120.18, 18,105.63 and 7,151.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.18 : 18,105.63 = 7,151.49 : x
2. Step 2: Convert to fraction form
   13,120.18/18,105.63 = 7,151.49/x
3. Step 3: Cross multiply
   13,120.18x = 18,105.63 × 7,151.49
4. Step 4: Simplify right side
   13,120.18x = 129,482,205.07
5. Step 5: Solve for x
   x = 129,482,205.07/13,120.18
6. Step 6: Final answer
   x = 9,868.94