Finding the Fourth Proportional to 2,078.89, 3,118.53 and 909

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.89 : 3,118.53 = 909 : x
2. Step 2: Convert to fraction form
   2,078.89/3,118.53 = 909/x
3. Step 3: Cross multiply
   2,078.89x = 3,118.53 × 909
4. Step 4: Simplify right side
   2,078.89x = 2,834,743.77
5. Step 5: Solve for x
   x = 2,834,743.77/2,078.89
6. Step 6: Final answer
   x = 1,363.59