Finding the Fourth Proportional to 2,021.10, 2,789.28 and 1,137.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,021.10 : 2,789.28 = 1,137.12 : x
2. Step 2: Convert to fraction form
   2,021.10/2,789.28 = 1,137.12/x
3. Step 3: Cross multiply
   2,021.10x = 2,789.28 × 1,137.12
4. Step 4: Simplify right side
   2,021.10x = 3,171,746.07
5. Step 5: Solve for x
   x = 3,171,746.07/2,021.10
6. Step 6: Final answer
   x = 1,569.32