Finding the Fourth Proportional to 2,103.69, 3,155.76 and 717.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.69 : 3,155.76 = 717.15 : x
2. Step 2: Convert to fraction form
   2,103.69/3,155.76 = 717.15/x
3. Step 3: Cross multiply
   2,103.69x = 3,155.76 × 717.15
4. Step 4: Simplify right side
   2,103.69x = 2,263,153.28
5. Step 5: Solve for x
   x = 2,263,153.28/2,103.69
6. Step 6: Final answer
   x = 1,075.80