Finding the Fourth Proportional to 1,408.79, 1,944.23 and 811.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.79 : 1,944.23 = 811.49 : x
2. Step 2: Convert to fraction form
   1,408.79/1,944.23 = 811.49/x
3. Step 3: Cross multiply
   1,408.79x = 1,944.23 × 811.49
4. Step 4: Simplify right side
   1,408.79x = 1,577,709.42
5. Step 5: Solve for x
   x = 1,577,709.42/1,408.79
6. Step 6: Final answer
   x = 1,119.91