Finding the Fourth Proportional to 2,022.42, 2,791.06 and 1,138.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,022.42 : 2,791.06 = 1,138.20 : x
2. Step 2: Convert to fraction form
   2,022.42/2,791.06 = 1,138.20/x
3. Step 3: Cross multiply
   2,022.42x = 2,791.06 × 1,138.20
4. Step 4: Simplify right side
   2,022.42x = 3,176,784.49
5. Step 5: Solve for x
   x = 3,176,784.49/2,022.42
6. Step 6: Final answer
   x = 1,570.78