Finding the Fourth Proportional to 2,021.40, 2,789.37 and 1,137.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,021.40 : 2,789.37 = 1,137.15 : x
2. Step 2: Convert to fraction form
   2,021.40/2,789.37 = 1,137.15/x
3. Step 3: Cross multiply
   2,021.40x = 2,789.37 × 1,137.15
4. Step 4: Simplify right side
   2,021.40x = 3,171,932.10
5. Step 5: Solve for x
   x = 3,171,932.10/2,021.40
6. Step 6: Final answer
   x = 1,569.18