Finding the Fourth Proportional to 2,603.78, 3,903.71 and 1,121.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.78 : 3,903.71 = 1,121.25 : x
2. Step 2: Convert to fraction form
   2,603.78/3,903.71 = 1,121.25/x
3. Step 3: Cross multiply
   2,603.78x = 3,903.71 × 1,121.25
4. Step 4: Simplify right side
   2,603.78x = 4,377,029.23
5. Step 5: Solve for x
   x = 4,377,029.23/2,603.78
6. Step 6: Final answer
   x = 1,681.03