Finding the Fourth Proportional to 2,740.48, 4,112.40 and 1,279.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,740.48 : 4,112.40 = 1,279.76 : x
2. Step 2: Convert to fraction form
   2,740.48/4,112.40 = 1,279.76/x
3. Step 3: Cross multiply
   2,740.48x = 4,112.40 × 1,279.76
4. Step 4: Simplify right side
   2,740.48x = 5,262,885.02
5. Step 5: Solve for x
   x = 5,262,885.02/2,740.48
6. Step 6: Final answer
   x = 1,920.42