Finding the Fourth Proportional to 2,659.42, 3,988.82 and 711.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.42 : 3,988.82 = 711.78 : x
2. Step 2: Convert to fraction form
   2,659.42/3,988.82 = 711.78/x
3. Step 3: Cross multiply
   2,659.42x = 3,988.82 × 711.78
4. Step 4: Simplify right side
   2,659.42x = 2,839,162.30
5. Step 5: Solve for x
   x = 2,839,162.30/2,659.42
6. Step 6: Final answer
   x = 1,067.59