Finding the Fourth Proportional to 2,647.98, 3,969.96 and 1,261.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.98 : 3,969.96 = 1,261.38 : x
2. Step 2: Convert to fraction form
   2,647.98/3,969.96 = 1,261.38/x
3. Step 3: Cross multiply
   2,647.98x = 3,969.96 × 1,261.38
4. Step 4: Simplify right side
   2,647.98x = 5,007,628.14
5. Step 5: Solve for x
   x = 5,007,628.14/2,647.98
6. Step 6: Final answer
   x = 1,891.11