Finding the Fourth Proportional to 2,417.18, 3,625.85 and 857.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,417.18 : 3,625.85 = 857.42 : x
2. Step 2: Convert to fraction form
   2,417.18/3,625.85 = 857.42/x
3. Step 3: Cross multiply
   2,417.18x = 3,625.85 × 857.42
4. Step 4: Simplify right side
   2,417.18x = 3,108,876.31
5. Step 5: Solve for x
   x = 3,108,876.31/2,417.18
6. Step 6: Final answer
   x = 1,286.16