Finding the Fourth Proportional to 2,608.02, 3,912.15 and 853.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,608.02 : 3,912.15 = 853.12 : x
2. Step 2: Convert to fraction form
   2,608.02/3,912.15 = 853.12/x
3. Step 3: Cross multiply
   2,608.02x = 3,912.15 × 853.12
4. Step 4: Simplify right side
   2,608.02x = 3,337,538.46
5. Step 5: Solve for x
   x = 3,337,538.46/2,608.02
6. Step 6: Final answer
   x = 1,279.72