Finding the Fourth Proportional to 3,105.30, 4,285.41 and 1,689.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,105.30 : 4,285.41 = 1,689.09 : x
2. Step 2: Convert to fraction form
   3,105.30/4,285.41 = 1,689.09/x
3. Step 3: Cross multiply
   3,105.30x = 4,285.41 × 1,689.09
4. Step 4: Simplify right side
   3,105.30x = 7,238,443.18
5. Step 5: Solve for x
   x = 7,238,443.18/3,105.30
6. Step 6: Final answer
   x = 2,331.00