Finding the Fourth Proportional to 3,105.42, 4,285.35 and 1,689.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,105.42 : 4,285.35 = 1,689.06 : x
2. Step 2: Convert to fraction form
   3,105.42/4,285.35 = 1,689.06/x
3. Step 3: Cross multiply
   3,105.42x = 4,285.35 × 1,689.06
4. Step 4: Simplify right side
   3,105.42x = 7,238,213.27
5. Step 5: Solve for x
   x = 7,238,213.27/3,105.42
6. Step 6: Final answer
   x = 2,330.83