Finding the Fourth Proportional to 1,383.06, 1,909.17 and 918.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.06 : 1,909.17 = 918.42 : x
2. Step 2: Convert to fraction form
   1,383.06/1,909.17 = 918.42/x
3. Step 3: Cross multiply
   1,383.06x = 1,909.17 × 918.42
4. Step 4: Simplify right side
   1,383.06x = 1,753,419.91
5. Step 5: Solve for x
   x = 1,753,419.91/1,383.06
6. Step 6: Final answer
   x = 1,267.78