Finding the Fourth Proportional to 2,603.17, 3,904.72 and 628.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.17 : 3,904.72 = 628.78 : x
2. Step 2: Convert to fraction form
   2,603.17/3,904.72 = 628.78/x
3. Step 3: Cross multiply
   2,603.17x = 3,904.72 × 628.78
4. Step 4: Simplify right side
   2,603.17x = 2,455,208.27
5. Step 5: Solve for x
   x = 2,455,208.27/2,603.17
6. Step 6: Final answer
   x = 943.16