Finding the Fourth Proportional to 1,383.78, 1,910.39 and 959.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.78 : 1,910.39 = 959.02 : x
2. Step 2: Convert to fraction form
   1,383.78/1,910.39 = 959.02/x
3. Step 3: Cross multiply
   1,383.78x = 1,910.39 × 959.02
4. Step 4: Simplify right side
   1,383.78x = 1,832,103.93
5. Step 5: Solve for x
   x = 1,832,103.93/1,383.78
6. Step 6: Final answer
   x = 1,323.99