Finding the Fourth Proportional to 2,103.78, 3,155.82 and 716.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.78 : 3,155.82 = 716.55 : x
2. Step 2: Convert to fraction form
   2,103.78/3,155.82 = 716.55/x
3. Step 3: Cross multiply
   2,103.78x = 3,155.82 × 716.55
4. Step 4: Simplify right side
   2,103.78x = 2,261,302.82
5. Step 5: Solve for x
   x = 2,261,302.82/2,103.78
6. Step 6: Final answer
   x = 1,074.88