Finding the Fourth Proportional to 2,283.18, 3,150.78 and 1,288.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,283.18 : 3,150.78 = 1,288.40 : x
2. Step 2: Convert to fraction form
   2,283.18/3,150.78 = 1,288.40/x
3. Step 3: Cross multiply
   2,283.18x = 3,150.78 × 1,288.40
4. Step 4: Simplify right side
   2,283.18x = 4,059,449.20
5. Step 5: Solve for x
   x = 4,059,449.20/2,283.18
6. Step 6: Final answer
   x = 1,777.98