Finding the Fourth Proportional to 2,659.56, 3,989.52 and 711.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.56 : 3,989.52 = 711.72 : x
2. Step 2: Convert to fraction form
   2,659.56/3,989.52 = 711.72/x
3. Step 3: Cross multiply
   2,659.56x = 3,989.52 × 711.72
4. Step 4: Simplify right side
   2,659.56x = 2,839,421.17
5. Step 5: Solve for x
   x = 2,839,421.17/2,659.56
6. Step 6: Final answer
   x = 1,067.63