Finding the Fourth Proportional to 1,145.57, 1,581.77 and 896.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.57 : 1,581.77 = 896.42 : x
2. Step 2: Convert to fraction form
   1,145.57/1,581.77 = 896.42/x
3. Step 3: Cross multiply
   1,145.57x = 1,581.77 × 896.42
4. Step 4: Simplify right side
   1,145.57x = 1,417,936.46
5. Step 5: Solve for x
   x = 1,417,936.46/1,145.57
6. Step 6: Final answer
   x = 1,237.76