Finding the Fourth Proportional to 1,561.94, 2,342.22 and 831.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.94 : 2,342.22 = 831.38 : x
2. Step 2: Convert to fraction form
   1,561.94/2,342.22 = 831.38/x
3. Step 3: Cross multiply
   1,561.94x = 2,342.22 × 831.38
4. Step 4: Simplify right side
   1,561.94x = 1,947,274.86
5. Step 5: Solve for x
   x = 1,947,274.86/1,561.94
6. Step 6: Final answer
   x = 1,246.70