Finding the Fourth Proportional to 2,603.50, 3,901.55 and 2,015.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.50 : 3,901.55 = 2,015.76 : x
2. Step 2: Convert to fraction form
   2,603.50/3,901.55 = 2,015.76/x
3. Step 3: Cross multiply
   2,603.50x = 3,901.55 × 2,015.76
4. Step 4: Simplify right side
   2,603.50x = 7,864,588.43
5. Step 5: Solve for x
   x = 7,864,588.43/2,603.50
6. Step 6: Final answer
   x = 3,020.78