Finding the Fourth Proportional to 2,022.15, 2,790.78 and 1,138.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,022.15 : 2,790.78 = 1,138.23 : x
2. Step 2: Convert to fraction form
   2,022.15/2,790.78 = 1,138.23/x
3. Step 3: Cross multiply
   2,022.15x = 2,790.78 × 1,138.23
4. Step 4: Simplify right side
   2,022.15x = 3,176,549.52
5. Step 5: Solve for x
   x = 3,176,549.52/2,022.15
6. Step 6: Final answer
   x = 1,570.88