Finding the Fourth Proportional to 2,658.42, 3,987.32 and 710.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658.42 : 3,987.32 = 710.78 : x
2. Step 2: Convert to fraction form
   2,658.42/3,987.32 = 710.78/x
3. Step 3: Cross multiply
   2,658.42x = 3,987.32 × 710.78
4. Step 4: Simplify right side
   2,658.42x = 2,834,087.37
5. Step 5: Solve for x
   x = 2,834,087.37/2,658.42
6. Step 6: Final answer
   x = 1,066.08