Finding the Fourth Proportional to 1,383.72, 1,908.54 and 964.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.72 : 1,908.54 = 964.22 : x
2. Step 2: Convert to fraction form
   1,383.72/1,908.54 = 964.22/x
3. Step 3: Cross multiply
   1,383.72x = 1,908.54 × 964.22
4. Step 4: Simplify right side
   1,383.72x = 1,840,242.90
5. Step 5: Solve for x
   x = 1,840,242.90/1,383.72
6. Step 6: Final answer
   x = 1,329.92