Finding the Fourth Proportional to 1,419.78, 1,960.40 and 1,279.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.78 : 1,960.40 = 1,279.34 : x
2. Step 2: Convert to fraction form
   1,419.78/1,960.40 = 1,279.34/x
3. Step 3: Cross multiply
   1,419.78x = 1,960.40 × 1,279.34
4. Step 4: Simplify right side
   1,419.78x = 2,508,029.91
5. Step 5: Solve for x
   x = 2,508,029.91/1,419.78
6. Step 6: Final answer
   x = 1,766.49