Finding the Fourth Proportional to 2,813.16, 4,219.86 and 965.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,813.16 : 4,219.86 = 965.55 : x
2. Step 2: Convert to fraction form
   2,813.16/4,219.86 = 965.55/x
3. Step 3: Cross multiply
   2,813.16x = 4,219.86 × 965.55
4. Step 4: Simplify right side
   2,813.16x = 4,074,485.82
5. Step 5: Solve for x
   x = 4,074,485.82/2,813.16
6. Step 6: Final answer
   x = 1,448.37