Finding the Fourth Proportional to 2,443.31, 3,665.21 and 688.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,443.31 : 3,665.21 = 688.31 : x
2. Step 2: Convert to fraction form
   2,443.31/3,665.21 = 688.31/x
3. Step 3: Cross multiply
   2,443.31x = 3,665.21 × 688.31
4. Step 4: Simplify right side
   2,443.31x = 2,522,797.25
5. Step 5: Solve for x
   x = 2,522,797.25/2,443.31
6. Step 6: Final answer
   x = 1,032.53