Finding the Fourth Proportional to 13,119.86, 18,105.42 and 7,151.41

Step by Step Solution

1. Step 1: Write the proportion equation
   13,119.86 : 18,105.42 = 7,151.41 : x
2. Step 2: Convert to fraction form
   13,119.86/18,105.42 = 7,151.41/x
3. Step 3: Cross multiply
   13,119.86x = 18,105.42 × 7,151.41
4. Step 4: Simplify right side
   13,119.86x = 129,479,281.64
5. Step 5: Solve for x
   x = 129,479,281.64/13,119.86
6. Step 6: Final answer
   x = 9,868.95