Finding the Fourth Proportional to 2,749.78, 4,122.71 and 1,288.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,749.78 : 4,122.71 = 1,288.14 : x
2. Step 2: Convert to fraction form
   2,749.78/4,122.71 = 1,288.14/x
3. Step 3: Cross multiply
   2,749.78x = 4,122.71 × 1,288.14
4. Step 4: Simplify right side
   2,749.78x = 5,310,607.05
5. Step 5: Solve for x
   x = 5,310,607.05/2,749.78
6. Step 6: Final answer
   x = 1,931.28