Finding the Fourth Proportional to 1,571.82, 2,355.23 and 831.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.82 : 2,355.23 = 831.42 : x
2. Step 2: Convert to fraction form
   1,571.82/2,355.23 = 831.42/x
3. Step 3: Cross multiply
   1,571.82x = 2,355.23 × 831.42
4. Step 4: Simplify right side
   1,571.82x = 1,958,181.17
5. Step 5: Solve for x
   x = 1,958,181.17/1,571.82
6. Step 6: Final answer
   x = 1,245.80