Finding the Fourth Proportional to 2,278.86, 3,144.72 and 1,284.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,278.86 : 3,144.72 = 1,284.11 : x
2. Step 2: Convert to fraction form
   2,278.86/3,144.72 = 1,284.11/x
3. Step 3: Cross multiply
   2,278.86x = 3,144.72 × 1,284.11
4. Step 4: Simplify right side
   2,278.86x = 4,038,166.40
5. Step 5: Solve for x
   x = 4,038,166.40/2,278.86
6. Step 6: Final answer
   x = 1,772.01