Finding the Fourth Proportional to 2,815.32, 4,221.69 and 965.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.32 : 4,221.69 = 965.96 : x
2. Step 2: Convert to fraction form
   2,815.32/4,221.69 = 965.96/x
3. Step 3: Cross multiply
   2,815.32x = 4,221.69 × 965.96
4. Step 4: Simplify right side
   2,815.32x = 4,077,962.56
5. Step 5: Solve for x
   x = 4,077,962.56/2,815.32
6. Step 6: Final answer
   x = 1,448.49