Finding the Fourth Proportional to 2,103.78, 3,152.18 and 1,279.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.78 : 3,152.18 = 1,279.56 : x
2. Step 2: Convert to fraction form
   2,103.78/3,152.18 = 1,279.56/x
3. Step 3: Cross multiply
   2,103.78x = 3,152.18 × 1,279.56
4. Step 4: Simplify right side
   2,103.78x = 4,033,406.64
5. Step 5: Solve for x
   x = 4,033,406.64/2,103.78
6. Step 6: Final answer
   x = 1,917.22