Finding the Fourth Proportional to 2,613.51, 3,919.41 and 858.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.51 : 3,919.41 = 858.04 : x
2. Step 2: Convert to fraction form
   2,613.51/3,919.41 = 858.04/x
3. Step 3: Cross multiply
   2,613.51x = 3,919.41 × 858.04
4. Step 4: Simplify right side
   2,613.51x = 3,363,000.76
5. Step 5: Solve for x
   x = 3,363,000.76/2,613.51
6. Step 6: Final answer
   x = 1,286.78