Finding the Fourth Proportional to 2,553.86, 3,831.74 and 1,320.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,553.86 : 3,831.74 = 1,320.48 : x
2. Step 2: Convert to fraction form
   2,553.86/3,831.74 = 1,320.48/x
3. Step 3: Cross multiply
   2,553.86x = 3,831.74 × 1,320.48
4. Step 4: Simplify right side
   2,553.86x = 5,059,736.04
5. Step 5: Solve for x
   x = 5,059,736.04/2,553.86
6. Step 6: Final answer
   x = 1,981.21