Finding the Fourth Proportional to 1,383.31, 1,909.20 and 793.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.31 : 1,909.20 = 793.90 : x
2. Step 2: Convert to fraction form
   1,383.31/1,909.20 = 793.90/x
3. Step 3: Cross multiply
   1,383.31x = 1,909.20 × 793.90
4. Step 4: Simplify right side
   1,383.31x = 1,515,713.88
5. Step 5: Solve for x
   x = 1,515,713.88/1,383.31
6. Step 6: Final answer
   x = 1,095.72