Finding the Fourth Proportional to 2,278.86, 3,144.78 and 1,284

Step by Step Solution

1. Step 1: Write the proportion equation
   2,278.86 : 3,144.78 = 1,284 : x
2. Step 2: Convert to fraction form
   2,278.86/3,144.78 = 1,284/x
3. Step 3: Cross multiply
   2,278.86x = 3,144.78 × 1,284
4. Step 4: Simplify right side
   2,278.86x = 4,037,897.52
5. Step 5: Solve for x
   x = 4,037,897.52/2,278.86
6. Step 6: Final answer
   x = 1,771.89