Finding the Fourth Proportional to 2,051.72, 2,831.40 and 1,120.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,051.72 : 2,831.40 = 1,120.20 : x
2. Step 2: Convert to fraction form
   2,051.72/2,831.40 = 1,120.20/x
3. Step 3: Cross multiply
   2,051.72x = 2,831.40 × 1,120.20
4. Step 4: Simplify right side
   2,051.72x = 3,171,734.28
5. Step 5: Solve for x
   x = 3,171,734.28/2,051.72
6. Step 6: Final answer
   x = 1,545.89