Finding the Fourth Proportional to 1,344.27, 1,855.55 and 813.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,344.27 : 1,855.55 = 813.45 : x
2. Step 2: Convert to fraction form
   1,344.27/1,855.55 = 813.45/x
3. Step 3: Cross multiply
   1,344.27x = 1,855.55 × 813.45
4. Step 4: Simplify right side
   1,344.27x = 1,509,397.15
5. Step 5: Solve for x
   x = 1,509,397.15/1,344.27
6. Step 6: Final answer
   x = 1,122.84