Finding the Fourth Proportional to 1,142.28, 1,713.96 and 1,085.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.28 : 1,713.96 = 1,085.94 : x
2. Step 2: Convert to fraction form
   1,142.28/1,713.96 = 1,085.94/x
3. Step 3: Cross multiply
   1,142.28x = 1,713.96 × 1,085.94
4. Step 4: Simplify right side
   1,142.28x = 1,861,257.72
5. Step 5: Solve for x
   x = 1,861,257.72/1,142.28
6. Step 6: Final answer
   x = 1,629.42