Finding the Fourth Proportional to 1,336.75, 1,844.72 and 812.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,336.75 : 1,844.72 = 812.78 : x
2. Step 2: Convert to fraction form
   1,336.75/1,844.72 = 812.78/x
3. Step 3: Cross multiply
   1,336.75x = 1,844.72 × 812.78
4. Step 4: Simplify right side
   1,336.75x = 1,499,352.07
5. Step 5: Solve for x
   x = 1,499,352.07/1,336.75
6. Step 6: Final answer
   x = 1,121.64