Finding the Fourth Proportional to 2,022.67, 2,790.45 and 1,225.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,022.67 : 2,790.45 = 1,225.78 : x
2. Step 2: Convert to fraction form
   2,022.67/2,790.45 = 1,225.78/x
3. Step 3: Cross multiply
   2,022.67x = 2,790.45 × 1,225.78
4. Step 4: Simplify right side
   2,022.67x = 3,420,486.52
5. Step 5: Solve for x
   x = 3,420,486.52/2,022.67
6. Step 6: Final answer
   x = 1,691.07