Finding the Fourth Proportional to 2,020.28, 2,787.62 and 1,223.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,020.28 : 2,787.62 = 1,223.42 : x
2. Step 2: Convert to fraction form
   2,020.28/2,787.62 = 1,223.42/x
3. Step 3: Cross multiply
   2,020.28x = 2,787.62 × 1,223.42
4. Step 4: Simplify right side
   2,020.28x = 3,410,410.01
5. Step 5: Solve for x
   x = 3,410,410.01/2,020.28
6. Step 6: Final answer
   x = 1,688.09