Finding the Fourth Proportional to 2,130.32, 3,196.92 and 831.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,130.32 : 3,196.92 = 831.62 : x
2. Step 2: Convert to fraction form
   2,130.32/3,196.92 = 831.62/x
3. Step 3: Cross multiply
   2,130.32x = 3,196.92 × 831.62
4. Step 4: Simplify right side
   2,130.32x = 2,658,622.61
5. Step 5: Solve for x
   x = 2,658,622.61/2,130.32
6. Step 6: Final answer
   x = 1,247.99