Finding the Fourth Proportional to 2,687.31, 4,029.37 and 931.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,687.31 : 4,029.37 = 931.43 : x
2. Step 2: Convert to fraction form
   2,687.31/4,029.37 = 931.43/x
3. Step 3: Cross multiply
   2,687.31x = 4,029.37 × 931.43
4. Step 4: Simplify right side
   2,687.31x = 3,753,083.84
5. Step 5: Solve for x
   x = 3,753,083.84/2,687.31
6. Step 6: Final answer
   x = 1,396.60