Finding the Fourth Proportional to 13,111.29, 18,093.15 and 7,142.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.29 : 18,093.15 = 7,142.88 : x
2. Step 2: Convert to fraction form
   13,111.29/18,093.15 = 7,142.88/x
3. Step 3: Cross multiply
   13,111.29x = 18,093.15 × 7,142.88
4. Step 4: Simplify right side
   13,111.29x = 129,237,199.27
5. Step 5: Solve for x
   x = 129,237,199.27/13,111.29
6. Step 6: Final answer
   x = 9,856.94