Finding the Fourth Proportional to 2,635.16, 3,945.98 and 2,557.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,635.16 : 3,945.98 = 2,557.28 : x
2. Step 2: Convert to fraction form
   2,635.16/3,945.98 = 2,557.28/x
3. Step 3: Cross multiply
   2,635.16x = 3,945.98 × 2,557.28
4. Step 4: Simplify right side
   2,635.16x = 10,090,975.73
5. Step 5: Solve for x
   x = 10,090,975.73/2,635.16
6. Step 6: Final answer
   x = 3,829.36