Finding the Fourth Proportional to 2,609.78, 3,915.84 and 1,149.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.78 : 3,915.84 = 1,149.36 : x
2. Step 2: Convert to fraction form
   2,609.78/3,915.84 = 1,149.36/x
3. Step 3: Cross multiply
   2,609.78x = 3,915.84 × 1,149.36
4. Step 4: Simplify right side
   2,609.78x = 4,500,709.86
5. Step 5: Solve for x
   x = 4,500,709.86/2,609.78
6. Step 6: Final answer
   x = 1,724.56