Finding the Fourth Proportional to 1,128.72, 1,694.02 and 581.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.72 : 1,694.02 = 581.42 : x
2. Step 2: Convert to fraction form
   1,128.72/1,694.02 = 581.42/x
3. Step 3: Cross multiply
   1,128.72x = 1,694.02 × 581.42
4. Step 4: Simplify right side
   1,128.72x = 984,937.11
5. Step 5: Solve for x
   x = 984,937.11/1,128.72
6. Step 6: Final answer
   x = 872.61