Finding the Fourth Proportional to 1,293.31, 1,940.30 and 831.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,293.31 : 1,940.30 = 831.32 : x
2. Step 2: Convert to fraction form
   1,293.31/1,940.30 = 831.32/x
3. Step 3: Cross multiply
   1,293.31x = 1,940.30 × 831.32
4. Step 4: Simplify right side
   1,293.31x = 1,612,996.34
5. Step 5: Solve for x
   x = 1,612,996.34/1,293.31
6. Step 6: Final answer
   x = 1,247.19