Finding the Fourth Proportional to 13,131.67, 18,121.52 and 7,163.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,131.67 : 18,121.52 = 7,163.34 : x
2. Step 2: Convert to fraction form
   13,131.67/18,121.52 = 7,163.34/x
3. Step 3: Cross multiply
   13,131.67x = 18,121.52 × 7,163.34
4. Step 4: Simplify right side
   13,131.67x = 129,810,559.03
5. Step 5: Solve for x
   x = 129,810,559.03/13,131.67
6. Step 6: Final answer
   x = 9,885.31