Finding the Fourth Proportional to 1,383.98, 1,909.06 and 886.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.98 : 1,909.06 = 886.43 : x
2. Step 2: Convert to fraction form
   1,383.98/1,909.06 = 886.43/x
3. Step 3: Cross multiply
   1,383.98x = 1,909.06 × 886.43
4. Step 4: Simplify right side
   1,383.98x = 1,692,250.61
5. Step 5: Solve for x
   x = 1,692,250.61/1,383.98
6. Step 6: Final answer
   x = 1,222.75