Finding the Fourth Proportional to 2,762.91, 4,139.35 and 1,279.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,762.91 : 4,139.35 = 1,279.40 : x
2. Step 2: Convert to fraction form
   2,762.91/4,139.35 = 1,279.40/x
3. Step 3: Cross multiply
   2,762.91x = 4,139.35 × 1,279.40
4. Step 4: Simplify right side
   2,762.91x = 5,295,867.69
5. Step 5: Solve for x
   x = 5,295,867.69/2,762.91
6. Step 6: Final answer
   x = 1,916.77