Finding the Fourth Proportional to 2,351.71, 3,527.51 and 685.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,351.71 : 3,527.51 = 685.89 : x
2. Step 2: Convert to fraction form
   2,351.71/3,527.51 = 685.89/x
3. Step 3: Cross multiply
   2,351.71x = 3,527.51 × 685.89
4. Step 4: Simplify right side
   2,351.71x = 2,419,468.49
5. Step 5: Solve for x
   x = 2,419,468.49/2,351.71
6. Step 6: Final answer
   x = 1,028.81