Finding the Fourth Proportional to 1,145.22, 1,716.72 and 712.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.22 : 1,716.72 = 712.14 : x
2. Step 2: Convert to fraction form
   1,145.22/1,716.72 = 712.14/x
3. Step 3: Cross multiply
   1,145.22x = 1,716.72 × 712.14
4. Step 4: Simplify right side
   1,145.22x = 1,222,544.98
5. Step 5: Solve for x
   x = 1,222,544.98/1,145.22
6. Step 6: Final answer
   x = 1,067.52