Finding the Fourth Proportional to 2,168.37, 3,253.48 and 687.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.37 : 3,253.48 = 687.71 : x
2. Step 2: Convert to fraction form
   2,168.37/3,253.48 = 687.71/x
3. Step 3: Cross multiply
   2,168.37x = 3,253.48 × 687.71
4. Step 4: Simplify right side
   2,168.37x = 2,237,459.72
5. Step 5: Solve for x
   x = 2,237,459.72/2,168.37
6. Step 6: Final answer
   x = 1,031.86