Finding the Fourth Proportional to 13,111.16, 18,093.78 and 7,143.08

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.16 : 18,093.78 = 7,143.08 : x
2. Step 2: Convert to fraction form
   13,111.16/18,093.78 = 7,143.08/x
3. Step 3: Cross multiply
   13,111.16x = 18,093.78 × 7,143.08
4. Step 4: Simplify right side
   13,111.16x = 129,245,227.57
5. Step 5: Solve for x
   x = 129,245,227.57/13,111.16
6. Step 6: Final answer
   x = 9,857.65