Finding the Fourth Proportional to 1,362.74, 1,880.71 and 831.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.74 : 1,880.71 = 831.58 : x
2. Step 2: Convert to fraction form
   1,362.74/1,880.71 = 831.58/x
3. Step 3: Cross multiply
   1,362.74x = 1,880.71 × 831.58
4. Step 4: Simplify right side
   1,362.74x = 1,563,954.04
5. Step 5: Solve for x
   x = 1,563,954.04/1,362.74
6. Step 6: Final answer
   x = 1,147.66