Finding the Fourth Proportional to 1,896.36, 2,616.89 and 1,057.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,896.36 : 2,616.89 = 1,057.15 : x
2. Step 2: Convert to fraction form
   1,896.36/2,616.89 = 1,057.15/x
3. Step 3: Cross multiply
   1,896.36x = 2,616.89 × 1,057.15
4. Step 4: Simplify right side
   1,896.36x = 2,766,443.25
5. Step 5: Solve for x
   x = 2,766,443.25/1,896.36
6. Step 6: Final answer
   x = 1,458.82