Finding the Fourth Proportional to 2,608.30, 3,912.79 and 852.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,608.30 : 3,912.79 = 852.69 : x
2. Step 2: Convert to fraction form
   2,608.30/3,912.79 = 852.69/x
3. Step 3: Cross multiply
   2,608.30x = 3,912.79 × 852.69
4. Step 4: Simplify right side
   2,608.30x = 3,336,396.91
5. Step 5: Solve for x
   x = 3,336,396.91/2,608.30
6. Step 6: Final answer
   x = 1,279.15