Finding the Fourth Proportional to 2,680.29, 4,015.59 and 1,291.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.29 : 4,015.59 = 1,291.65 : x
2. Step 2: Convert to fraction form
   2,680.29/4,015.59 = 1,291.65/x
3. Step 3: Cross multiply
   2,680.29x = 4,015.59 × 1,291.65
4. Step 4: Simplify right side
   2,680.29x = 5,186,736.82
5. Step 5: Solve for x
   x = 5,186,736.82/2,680.29
6. Step 6: Final answer
   x = 1,935.14