Finding the Fourth Proportional to 13,185.21, 18,196.82 and 7,879.92

Step by Step Solution

1. Step 1: Write the proportion equation
   13,185.21 : 18,196.82 = 7,879.92 : x
2. Step 2: Convert to fraction form
   13,185.21/18,196.82 = 7,879.92/x
3. Step 3: Cross multiply
   13,185.21x = 18,196.82 × 7,879.92
4. Step 4: Simplify right side
   13,185.21x = 143,389,485.85
5. Step 5: Solve for x
   x = 143,389,485.85/13,185.21
6. Step 6: Final answer
   x = 10,875.02