Finding the Fourth Proportional to 2,021.23, 2,789.40 and 1,137.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,021.23 : 2,789.40 = 1,137.05 : x
2. Step 2: Convert to fraction form
   2,021.23/2,789.40 = 1,137.05/x
3. Step 3: Cross multiply
   2,021.23x = 2,789.40 × 1,137.05
4. Step 4: Simplify right side
   2,021.23x = 3,171,687.27
5. Step 5: Solve for x
   x = 3,171,687.27/2,021.23
6. Step 6: Final answer
   x = 1,569.19