Finding the Fourth Proportional to 1,144.22, 1,713.57 and 1,086.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.22 : 1,713.57 = 1,086.80 : x
2. Step 2: Convert to fraction form
   1,144.22/1,713.57 = 1,086.80/x
3. Step 3: Cross multiply
   1,144.22x = 1,713.57 × 1,086.80
4. Step 4: Simplify right side
   1,144.22x = 1,862,299.31
5. Step 5: Solve for x
   x = 1,862,299.31/1,144.22
6. Step 6: Final answer
   x = 1,627.58