Finding the Fourth Proportional to 1,078.72, 1,613.72 and 896.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.72 : 1,613.72 = 896.48 : x
2. Step 2: Convert to fraction form
   1,078.72/1,613.72 = 896.48/x
3. Step 3: Cross multiply
   1,078.72x = 1,613.72 × 896.48
4. Step 4: Simplify right side
   1,078.72x = 1,446,667.71
5. Step 5: Solve for x
   x = 1,446,667.71/1,078.72
6. Step 6: Final answer
   x = 1,341.10