Finding the Fourth Proportional to 2,680.92, 4,019.66 and 1,291.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.92 : 4,019.66 = 1,291.50 : x
2. Step 2: Convert to fraction form
   2,680.92/4,019.66 = 1,291.50/x
3. Step 3: Cross multiply
   2,680.92x = 4,019.66 × 1,291.50
4. Step 4: Simplify right side
   2,680.92x = 5,191,390.89
5. Step 5: Solve for x
   x = 5,191,390.89/2,680.92
6. Step 6: Final answer
   x = 1,936.42