Finding the Fourth Proportional to 2,779.94, 4,168.69 and 831.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,779.94 : 4,168.69 = 831.69 : x
2. Step 2: Convert to fraction form
   2,779.94/4,168.69 = 831.69/x
3. Step 3: Cross multiply
   2,779.94x = 4,168.69 × 831.69
4. Step 4: Simplify right side
   2,779.94x = 3,467,057.79
5. Step 5: Solve for x
   x = 3,467,057.79/2,779.94
6. Step 6: Final answer
   x = 1,247.17