Finding the Fourth Proportional to 1,383.91, 1,909.79 and 762.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.91 : 1,909.79 = 762.91 : x
2. Step 2: Convert to fraction form
   1,383.91/1,909.79 = 762.91/x
3. Step 3: Cross multiply
   1,383.91x = 1,909.79 × 762.91
4. Step 4: Simplify right side
   1,383.91x = 1,456,997.89
5. Step 5: Solve for x
   x = 1,456,997.89/1,383.91
6. Step 6: Final answer
   x = 1,052.81