Finding the Fourth Proportional to 1,686.40, 2,327.31 and 940.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.40 : 2,327.31 = 940.37 : x
2. Step 2: Convert to fraction form
   1,686.40/2,327.31 = 940.37/x
3. Step 3: Cross multiply
   1,686.40x = 2,327.31 × 940.37
4. Step 4: Simplify right side
   1,686.40x = 2,188,520.87
5. Step 5: Solve for x
   x = 2,188,520.87/1,686.40
6. Step 6: Final answer
   x = 1,297.75