Finding the Fourth Proportional to 2,659.74, 3,989.60 and 711.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.74 : 3,989.60 = 711.89 : x
2. Step 2: Convert to fraction form
   2,659.74/3,989.60 = 711.89/x
3. Step 3: Cross multiply
   2,659.74x = 3,989.60 × 711.89
4. Step 4: Simplify right side
   2,659.74x = 2,840,156.34
5. Step 5: Solve for x
   x = 2,840,156.34/2,659.74
6. Step 6: Final answer
   x = 1,067.83