Finding the Fourth Proportional to 2,603.53, 3,906.78 and 959.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.53 : 3,906.78 = 959.86 : x
2. Step 2: Convert to fraction form
   2,603.53/3,906.78 = 959.86/x
3. Step 3: Cross multiply
   2,603.53x = 3,906.78 × 959.86
4. Step 4: Simplify right side
   2,603.53x = 3,749,961.85
5. Step 5: Solve for x
   x = 3,749,961.85/2,603.53
6. Step 6: Final answer
   x = 1,440.34