Finding the Fourth Proportional to 5,105.72, 7,046.54 and 3,115.85

Step by Step Solution

1. Step 1: Write the proportion equation
   5,105.72 : 7,046.54 = 3,115.85 : x
2. Step 2: Convert to fraction form
   5,105.72/7,046.54 = 3,115.85/x
3. Step 3: Cross multiply
   5,105.72x = 7,046.54 × 3,115.85
4. Step 4: Simplify right side
   5,105.72x = 21,955,910.85
5. Step 5: Solve for x
   x = 21,955,910.85/5,105.72
6. Step 6: Final answer
   x = 4,300.26