Finding the Fourth Proportional to 1,185.22, 1,635.15 and 831.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.22 : 1,635.15 = 831.34 : x
2. Step 2: Convert to fraction form
   1,185.22/1,635.15 = 831.34/x
3. Step 3: Cross multiply
   1,185.22x = 1,635.15 × 831.34
4. Step 4: Simplify right side
   1,185.22x = 1,359,365.60
5. Step 5: Solve for x
   x = 1,359,365.60/1,185.22
6. Step 6: Final answer
   x = 1,146.93