Finding the Fourth Proportional to 13,111.14, 18,093.78 and 7,143.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.14 : 18,093.78 = 7,143.06 : x
2. Step 2: Convert to fraction form
   13,111.14/18,093.78 = 7,143.06/x
3. Step 3: Cross multiply
   13,111.14x = 18,093.78 × 7,143.06
4. Step 4: Simplify right side
   13,111.14x = 129,244,956.17
5. Step 5: Solve for x
   x = 129,244,956.17/13,111.14
6. Step 6: Final answer
   x = 9,857.64