Finding the Fourth Proportional to 13,111.57, 18,093.99 and 7,143.22

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.57 : 18,093.99 = 7,143.22 : x
2. Step 2: Convert to fraction form
   13,111.57/18,093.99 = 7,143.22/x
3. Step 3: Cross multiply
   13,111.57x = 18,093.99 × 7,143.22
4. Step 4: Simplify right side
   13,111.57x = 129,249,351.25
5. Step 5: Solve for x
   x = 129,249,351.25/13,111.57
6. Step 6: Final answer
   x = 9,857.66