Finding the Fourth Proportional to 2,020.13, 2,786.83 and 1,311.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,020.13 : 2,786.83 = 1,311.92 : x
2. Step 2: Convert to fraction form
   2,020.13/2,786.83 = 1,311.92/x
3. Step 3: Cross multiply
   2,020.13x = 2,786.83 × 1,311.92
4. Step 4: Simplify right side
   2,020.13x = 3,656,098.01
5. Step 5: Solve for x
   x = 3,656,098.01/2,020.13
6. Step 6: Final answer
   x = 1,809.83