Finding the Fourth Proportional to 2,557.24, 3,835.89 and 1,860.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.24 : 3,835.89 = 1,860.57 : x
2. Step 2: Convert to fraction form
   2,557.24/3,835.89 = 1,860.57/x
3. Step 3: Cross multiply
   2,557.24x = 3,835.89 × 1,860.57
4. Step 4: Simplify right side
   2,557.24x = 7,136,941.86
5. Step 5: Solve for x
   x = 7,136,941.86/2,557.24
6. Step 6: Final answer
   x = 2,790.88