Finding the Fourth Proportional to 1,383.28, 1,908.60 and 935.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.28 : 1,908.60 = 935.98 : x
2. Step 2: Convert to fraction form
   1,383.28/1,908.60 = 935.98/x
3. Step 3: Cross multiply
   1,383.28x = 1,908.60 × 935.98
4. Step 4: Simplify right side
   1,383.28x = 1,786,411.43
5. Step 5: Solve for x
   x = 1,786,411.43/1,383.28
6. Step 6: Final answer
   x = 1,291.43