Finding the Fourth Proportional to 2,064.72, 3,096.60 and 831.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,064.72 : 3,096.60 = 831.60 : x
2. Step 2: Convert to fraction form
   2,064.72/3,096.60 = 831.60/x
3. Step 3: Cross multiply
   2,064.72x = 3,096.60 × 831.60
4. Step 4: Simplify right side
   2,064.72x = 2,575,132.56
5. Step 5: Solve for x
   x = 2,575,132.56/2,064.72
6. Step 6: Final answer
   x = 1,247.21