Finding the Fourth Proportional to 13,173.69, 18,180.05 and 7,871.58

Step by Step Solution

1. Step 1: Write the proportion equation
   13,173.69 : 18,180.05 = 7,871.58 : x
2. Step 2: Convert to fraction form
   13,173.69/18,180.05 = 7,871.58/x
3. Step 3: Cross multiply
   13,173.69x = 18,180.05 × 7,871.58
4. Step 4: Simplify right side
   13,173.69x = 143,105,678.62
5. Step 5: Solve for x
   x = 143,105,678.62/13,173.69
6. Step 6: Final answer
   x = 10,862.99