Finding the Fourth Proportional to 11,105.34, 15,311.43 and 7,119.42

Step by Step Solution

1. Step 1: Write the proportion equation
   11,105.34 : 15,311.43 = 7,119.42 : x
2. Step 2: Convert to fraction form
   11,105.34/15,311.43 = 7,119.42/x
3. Step 3: Cross multiply
   11,105.34x = 15,311.43 × 7,119.42
4. Step 4: Simplify right side
   11,105.34x = 109,008,500.97
5. Step 5: Solve for x
   x = 109,008,500.97/11,105.34
6. Step 6: Final answer
   x = 9,815.86