Finding the Fourth Proportional to 2,579.55, 3,871.38 and 936.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,579.55 : 3,871.38 = 936.57 : x
2. Step 2: Convert to fraction form
   2,579.55/3,871.38 = 936.57/x
3. Step 3: Cross multiply
   2,579.55x = 3,871.38 × 936.57
4. Step 4: Simplify right side
   2,579.55x = 3,625,818.37
5. Step 5: Solve for x
   x = 3,625,818.37/2,579.55
6. Step 6: Final answer
   x = 1,405.60