Finding the Fourth Proportional to 2,611.09, 3,918.17 and 968.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.09 : 3,918.17 = 968.78 : x
2. Step 2: Convert to fraction form
   2,611.09/3,918.17 = 968.78/x
3. Step 3: Cross multiply
   2,611.09x = 3,918.17 × 968.78
4. Step 4: Simplify right side
   2,611.09x = 3,795,820.30
5. Step 5: Solve for x
   x = 3,795,820.30/2,611.09
6. Step 6: Final answer
   x = 1,453.73