Finding the Fourth Proportional to 2,609.30, 3,913.79 and 965.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.30 : 3,913.79 = 965.72 : x
2. Step 2: Convert to fraction form
   2,609.30/3,913.79 = 965.72/x
3. Step 3: Cross multiply
   2,609.30x = 3,913.79 × 965.72
4. Step 4: Simplify right side
   2,609.30x = 3,779,630.23
5. Step 5: Solve for x
   x = 3,779,630.23/2,609.30
6. Step 6: Final answer
   x = 1,448.52