Finding the Fourth Proportional to 2,278.89, 3,144.87 and 1,284.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,278.89 : 3,144.87 = 1,284.12 : x
2. Step 2: Convert to fraction form
   2,278.89/3,144.87 = 1,284.12/x
3. Step 3: Cross multiply
   2,278.89x = 3,144.87 × 1,284.12
4. Step 4: Simplify right side
   2,278.89x = 4,038,390.46
5. Step 5: Solve for x
   x = 4,038,390.46/2,278.89
6. Step 6: Final answer
   x = 1,772.09