Finding the Fourth Proportional to 3,408.25, 5,111.78 and 909.47

Step by Step Solution

1. Step 1: Write the proportion equation
   3,408.25 : 5,111.78 = 909.47 : x
2. Step 2: Convert to fraction form
   3,408.25/5,111.78 = 909.47/x
3. Step 3: Cross multiply
   3,408.25x = 5,111.78 × 909.47
4. Step 4: Simplify right side
   3,408.25x = 4,649,010.56
5. Step 5: Solve for x
   x = 4,649,010.56/3,408.25
6. Step 6: Final answer
   x = 1,364.05