Finding the Fourth Proportional to 1,145.59, 1,718.72 and 812.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.59 : 1,718.72 = 812.68 : x
2. Step 2: Convert to fraction form
   1,145.59/1,718.72 = 812.68/x
3. Step 3: Cross multiply
   1,145.59x = 1,718.72 × 812.68
4. Step 4: Simplify right side
   1,145.59x = 1,396,760.78
5. Step 5: Solve for x
   x = 1,396,760.78/1,145.59
6. Step 6: Final answer
   x = 1,219.26