Finding the Fourth Proportional to 1,383.38, 1,909.28 and 885.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.38 : 1,909.28 = 885.99 : x
2. Step 2: Convert to fraction form
   1,383.38/1,909.28 = 885.99/x
3. Step 3: Cross multiply
   1,383.38x = 1,909.28 × 885.99
4. Step 4: Simplify right side
   1,383.38x = 1,691,598.56
5. Step 5: Solve for x
   x = 1,691,598.56/1,383.38
6. Step 6: Final answer
   x = 1,222.81