Finding the Fourth Proportional to 2,611.89, 3,919.37 and 969.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.89 : 3,919.37 = 969.57 : x
2. Step 2: Convert to fraction form
   2,611.89/3,919.37 = 969.57/x
3. Step 3: Cross multiply
   2,611.89x = 3,919.37 × 969.57
4. Step 4: Simplify right side
   2,611.89x = 3,800,098.72
5. Step 5: Solve for x
   x = 3,800,098.72/2,611.89
6. Step 6: Final answer
   x = 1,454.92