Finding the Fourth Proportional to 2,608.29, 3,912.42 and 878.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,608.29 : 3,912.42 = 878.13 : x
2. Step 2: Convert to fraction form
   2,608.29/3,912.42 = 878.13/x
3. Step 3: Cross multiply
   2,608.29x = 3,912.42 × 878.13
4. Step 4: Simplify right side
   2,608.29x = 3,435,613.37
5. Step 5: Solve for x
   x = 3,435,613.37/2,608.29
6. Step 6: Final answer
   x = 1,317.19