Finding the Fourth Proportional to 2,716.69, 4,072.20 and 1,256.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,716.69 : 4,072.20 = 1,256.80 : x
2. Step 2: Convert to fraction form
   2,716.69/4,072.20 = 1,256.80/x
3. Step 3: Cross multiply
   2,716.69x = 4,072.20 × 1,256.80
4. Step 4: Simplify right side
   2,716.69x = 5,117,940.96
5. Step 5: Solve for x
   x = 5,117,940.96/2,716.69
6. Step 6: Final answer
   x = 1,883.89