Finding the Fourth Proportional to 2,022.50, 2,791.02 and 1,138.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,022.50 : 2,791.02 = 1,138.30 : x
2. Step 2: Convert to fraction form
   2,022.50/2,791.02 = 1,138.30/x
3. Step 3: Cross multiply
   2,022.50x = 2,791.02 × 1,138.30
4. Step 4: Simplify right side
   2,022.50x = 3,177,018.07
5. Step 5: Solve for x
   x = 3,177,018.07/2,022.50
6. Step 6: Final answer
   x = 1,570.84