Finding the Fourth Proportional to 2,643.94, 3,965.57 and 696.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.94 : 3,965.57 = 696.30 : x
2. Step 2: Convert to fraction form
   2,643.94/3,965.57 = 696.30/x
3. Step 3: Cross multiply
   2,643.94x = 3,965.57 × 696.30
4. Step 4: Simplify right side
   2,643.94x = 2,761,226.39
5. Step 5: Solve for x
   x = 2,761,226.39/2,643.94
6. Step 6: Final answer
   x = 1,044.36