Finding the Fourth Proportional to 2,417.55, 3,626.60 and 857.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,417.55 : 3,626.60 = 857.22 : x
2. Step 2: Convert to fraction form
   2,417.55/3,626.60 = 857.22/x
3. Step 3: Cross multiply
   2,417.55x = 3,626.60 × 857.22
4. Step 4: Simplify right side
   2,417.55x = 3,108,789.77
5. Step 5: Solve for x
   x = 3,108,789.77/2,417.55
6. Step 6: Final answer
   x = 1,285.93