Finding the Fourth Proportional to 1,383.17, 1,908.24 and 885.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.17 : 1,908.24 = 885.72 : x
2. Step 2: Convert to fraction form
   1,383.17/1,908.24 = 885.72/x
3. Step 3: Cross multiply
   1,383.17x = 1,908.24 × 885.72
4. Step 4: Simplify right side
   1,383.17x = 1,690,166.33
5. Step 5: Solve for x
   x = 1,690,166.33/1,383.17
6. Step 6: Final answer
   x = 1,221.96