Finding the Fourth Proportional to 2,659.59, 3,987.41 and 1,271.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.59 : 3,987.41 = 1,271.79 : x
2. Step 2: Convert to fraction form
   2,659.59/3,987.41 = 1,271.79/x
3. Step 3: Cross multiply
   2,659.59x = 3,987.41 × 1,271.79
4. Step 4: Simplify right side
   2,659.59x = 5,071,141.80
5. Step 5: Solve for x
   x = 5,071,141.80/2,659.59
6. Step 6: Final answer
   x = 1,906.74