Finding the Fourth Proportional to 2,022.30, 2,790.72 and 1,138.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,022.30 : 2,790.72 = 1,138.29 : x
2. Step 2: Convert to fraction form
   2,022.30/2,790.72 = 1,138.29/x
3. Step 3: Cross multiply
   2,022.30x = 2,790.72 × 1,138.29
4. Step 4: Simplify right side
   2,022.30x = 3,176,648.67
5. Step 5: Solve for x
   x = 3,176,648.67/2,022.30
6. Step 6: Final answer
   x = 1,570.81