Finding the Fourth Proportional to 1,279.72, 1,908.56 and 1,256.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.72 : 1,908.56 = 1,256.68 : x
2. Step 2: Convert to fraction form
   1,279.72/1,908.56 = 1,256.68/x
3. Step 3: Cross multiply
   1,279.72x = 1,908.56 × 1,256.68
4. Step 4: Simplify right side
   1,279.72x = 2,398,449.18
5. Step 5: Solve for x
   x = 2,398,449.18/1,279.72
6. Step 6: Final answer
   x = 1,874.20