Finding the Fourth Proportional to 1,383.80, 1,908.96 and 912.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.80 : 1,908.96 = 912.52 : x
2. Step 2: Convert to fraction form
   1,383.80/1,908.96 = 912.52/x
3. Step 3: Cross multiply
   1,383.80x = 1,908.96 × 912.52
4. Step 4: Simplify right side
   1,383.80x = 1,741,964.18
5. Step 5: Solve for x
   x = 1,741,964.18/1,383.80
6. Step 6: Final answer
   x = 1,258.83