Finding the Fourth Proportional to 2,275.76, 3,140.42 and 1,281.00

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.76 : 3,140.42 = 1,281.00 : x
2. Step 2: Convert to fraction form
   2,275.76/3,140.42 = 1,281.00/x
3. Step 3: Cross multiply
   2,275.76x = 3,140.42 × 1,281.00
4. Step 4: Simplify right side
   2,275.76x = 4,022,883.39
5. Step 5: Solve for x
   x = 4,022,883.39/2,275.76
6. Step 6: Final answer
   x = 1,767.71