Finding the Fourth Proportional to 2,608.34, 3,911.78 and 852.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,608.34 : 3,911.78 = 852.72 : x
2. Step 2: Convert to fraction form
   2,608.34/3,911.78 = 852.72/x
3. Step 3: Cross multiply
   2,608.34x = 3,911.78 × 852.72
4. Step 4: Simplify right side
   2,608.34x = 3,335,648.78
5. Step 5: Solve for x
   x = 3,335,648.78/2,608.34
6. Step 6: Final answer
   x = 1,278.84