Finding the Fourth Proportional to 2,643.36, 3,964.72 and 695.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.36 : 3,964.72 = 695.71 : x
2. Step 2: Convert to fraction form
   2,643.36/3,964.72 = 695.71/x
3. Step 3: Cross multiply
   2,643.36x = 3,964.72 × 695.71
4. Step 4: Simplify right side
   2,643.36x = 2,758,295.35
5. Step 5: Solve for x
   x = 2,758,295.35/2,643.36
6. Step 6: Final answer
   x = 1,043.48