Finding the Fourth Proportional to 1,408.80, 1,944.27 and 811.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.80 : 1,944.27 = 811.38 : x
2. Step 2: Convert to fraction form
   1,408.80/1,944.27 = 811.38/x
3. Step 3: Cross multiply
   1,408.80x = 1,944.27 × 811.38
4. Step 4: Simplify right side
   1,408.80x = 1,577,541.79
5. Step 5: Solve for x
   x = 1,577,541.79/1,408.80
6. Step 6: Final answer
   x = 1,119.78