Finding the Fourth Proportional to 13,111.62, 18,093.98 and 7,143.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.62 : 18,093.98 = 7,143.24 : x
2. Step 2: Convert to fraction form
   13,111.62/18,093.98 = 7,143.24/x
3. Step 3: Cross multiply
   13,111.62x = 18,093.98 × 7,143.24
4. Step 4: Simplify right side
   13,111.62x = 129,249,625.63
5. Step 5: Solve for x
   x = 129,249,625.63/13,111.62
6. Step 6: Final answer
   x = 9,857.64