Finding the Fourth Proportional to 2,557.59, 3,813.87 and 2,355.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.59 : 3,813.87 = 2,355.63 : x
2. Step 2: Convert to fraction form
   2,557.59/3,813.87 = 2,355.63/x
3. Step 3: Cross multiply
   2,557.59x = 3,813.87 × 2,355.63
4. Step 4: Simplify right side
   2,557.59x = 8,984,066.59
5. Step 5: Solve for x
   x = 8,984,066.59/2,557.59
6. Step 6: Final answer
   x = 3,512.71