Finding the Fourth Proportional to 3,105.72, 4,285.97 and 1,689.49

Step by Step Solution

1. Step 1: Write the proportion equation
   3,105.72 : 4,285.97 = 1,689.49 : x
2. Step 2: Convert to fraction form
   3,105.72/4,285.97 = 1,689.49/x
3. Step 3: Cross multiply
   3,105.72x = 4,285.97 × 1,689.49
4. Step 4: Simplify right side
   3,105.72x = 7,241,082.03
5. Step 5: Solve for x
   x = 7,241,082.03/3,105.72
6. Step 6: Final answer
   x = 2,331.53