Finding the Fourth Proportional to 2,021, 2,787.90 and 1,356.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,021 : 2,787.90 = 1,356.72 : x
2. Step 2: Convert to fraction form
   2,021/2,787.90 = 1,356.72/x
3. Step 3: Cross multiply
   2,021x = 2,787.90 × 1,356.72
4. Step 4: Simplify right side
   2,021x = 3,782,399.69
5. Step 5: Solve for x
   x = 3,782,399.69/2,021
6. Step 6: Final answer
   x = 1,871.55