Finding the Fourth Proportional to 2,131.56, 3,196.02 and 831.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.56 : 3,196.02 = 831.50 : x
2. Step 2: Convert to fraction form
   2,131.56/3,196.02 = 831.50/x
3. Step 3: Cross multiply
   2,131.56x = 3,196.02 × 831.50
4. Step 4: Simplify right side
   2,131.56x = 2,657,490.63
5. Step 5: Solve for x
   x = 2,657,490.63/2,131.56
6. Step 6: Final answer
   x = 1,246.74