Finding the Fourth Proportional to 13,111.09, 18,093.75 and 7,143.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.09 : 18,093.75 = 7,143.31 : x
2. Step 2: Convert to fraction form
   13,111.09/18,093.75 = 7,143.31/x
3. Step 3: Cross multiply
   13,111.09x = 18,093.75 × 7,143.31
4. Step 4: Simplify right side
   13,111.09x = 129,249,372.30
5. Step 5: Solve for x
   x = 129,249,372.30/13,111.09
6. Step 6: Final answer
   x = 9,858.02