Finding the Fourth Proportional to 2,831.86, 4,243.46 and 1,187.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,831.86 : 4,243.46 = 1,187.51 : x
2. Step 2: Convert to fraction form
   2,831.86/4,243.46 = 1,187.51/x
3. Step 3: Cross multiply
   2,831.86x = 4,243.46 × 1,187.51
4. Step 4: Simplify right side
   2,831.86x = 5,039,151.18
5. Step 5: Solve for x
   x = 5,039,151.18/2,831.86
6. Step 6: Final answer
   x = 1,779.45