Finding the Fourth Proportional to 2,815.72, 4,218.93 and 965.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.72 : 4,218.93 = 965.81 : x
2. Step 2: Convert to fraction form
   2,815.72/4,218.93 = 965.81/x
3. Step 3: Cross multiply
   2,815.72x = 4,218.93 × 965.81
4. Step 4: Simplify right side
   2,815.72x = 4,074,684.78
5. Step 5: Solve for x
   x = 4,074,684.78/2,815.72
6. Step 6: Final answer
   x = 1,447.12