Finding the Fourth Proportional to 1,355.96, 1,871.04 and 831.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.96 : 1,871.04 = 831.88 : x
2. Step 2: Convert to fraction form
   1,355.96/1,871.04 = 831.88/x
3. Step 3: Cross multiply
   1,355.96x = 1,871.04 × 831.88
4. Step 4: Simplify right side
   1,355.96x = 1,556,480.76
5. Step 5: Solve for x
   x = 1,556,480.76/1,355.96
6. Step 6: Final answer
   x = 1,147.88