Finding the Fourth Proportional to 2,608.02, 3,912.91 and 853.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,608.02 : 3,912.91 = 853.11 : x
2. Step 2: Convert to fraction form
   2,608.02/3,912.91 = 853.11/x
3. Step 3: Cross multiply
   2,608.02x = 3,912.91 × 853.11
4. Step 4: Simplify right side
   2,608.02x = 3,338,118.82
5. Step 5: Solve for x
   x = 3,338,118.82/2,608.02
6. Step 6: Final answer
   x = 1,279.94