Finding the Fourth Proportional to 1,145.16, 1,576.72 and 1,010.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.16 : 1,576.72 = 1,010.42 : x
2. Step 2: Convert to fraction form
   1,145.16/1,576.72 = 1,010.42/x
3. Step 3: Cross multiply
   1,145.16x = 1,576.72 × 1,010.42
4. Step 4: Simplify right side
   1,145.16x = 1,593,149.42
5. Step 5: Solve for x
   x = 1,593,149.42/1,145.16
6. Step 6: Final answer
   x = 1,391.20