Finding the Fourth Proportional to 1,383.96, 1,909.86 and 886.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.96 : 1,909.86 = 886.44 : x
2. Step 2: Convert to fraction form
   1,383.96/1,909.86 = 886.44/x
3. Step 3: Cross multiply
   1,383.96x = 1,909.86 × 886.44
4. Step 4: Simplify right side
   1,383.96x = 1,692,976.30
5. Step 5: Solve for x
   x = 1,692,976.30/1,383.96
6. Step 6: Final answer
   x = 1,223.28