Finding the Fourth Proportional to 2,659.96, 3,985.89 and 1,271.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.96 : 3,985.89 = 1,271.39 : x
2. Step 2: Convert to fraction form
   2,659.96/3,985.89 = 1,271.39/x
3. Step 3: Cross multiply
   2,659.96x = 3,985.89 × 1,271.39
4. Step 4: Simplify right side
   2,659.96x = 5,067,610.72
5. Step 5: Solve for x
   x = 5,067,610.72/2,659.96
6. Step 6: Final answer
   x = 1,905.15