Finding the Fourth Proportional to 1,383.84, 1,908.86 and 886.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.84 : 1,908.86 = 886.30 : x
2. Step 2: Convert to fraction form
   1,383.84/1,908.86 = 886.30/x
3. Step 3: Cross multiply
   1,383.84x = 1,908.86 × 886.30
4. Step 4: Simplify right side
   1,383.84x = 1,691,822.62
5. Step 5: Solve for x
   x = 1,691,822.62/1,383.84
6. Step 6: Final answer
   x = 1,222.56