Finding the Fourth Proportional to 2,275.15, 3,414.56 and 1,288.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.15 : 3,414.56 = 1,288.57 : x
2. Step 2: Convert to fraction form
   2,275.15/3,414.56 = 1,288.57/x
3. Step 3: Cross multiply
   2,275.15x = 3,414.56 × 1,288.57
4. Step 4: Simplify right side
   2,275.15x = 4,399,899.58
5. Step 5: Solve for x
   x = 4,399,899.58/2,275.15
6. Step 6: Final answer
   x = 1,933.89