Finding the Fourth Proportional to 2,611.98, 3,918.78 and 1,151.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.98 : 3,918.78 = 1,151.28 : x
2. Step 2: Convert to fraction form
   2,611.98/3,918.78 = 1,151.28/x
3. Step 3: Cross multiply
   2,611.98x = 3,918.78 × 1,151.28
4. Step 4: Simplify right side
   2,611.98x = 4,511,613.04
5. Step 5: Solve for x
   x = 4,511,613.04/2,611.98
6. Step 6: Final answer
   x = 1,727.28