Finding the Fourth Proportional to 2,603.05, 3,899.55 and 2,017.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.05 : 3,899.55 = 2,017.72 : x
2. Step 2: Convert to fraction form
   2,603.05/3,899.55 = 2,017.72/x
3. Step 3: Cross multiply
   2,603.05x = 3,899.55 × 2,017.72
4. Step 4: Simplify right side
   2,603.05x = 7,868,200.03
5. Step 5: Solve for x
   x = 7,868,200.03/2,603.05
6. Step 6: Final answer
   x = 3,022.68