Finding the Fourth Proportional to 2,066.58, 3,099.57 and 679.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,066.58 : 3,099.57 = 679.98 : x
2. Step 2: Convert to fraction form
   2,066.58/3,099.57 = 679.98/x
3. Step 3: Cross multiply
   2,066.58x = 3,099.57 × 679.98
4. Step 4: Simplify right side
   2,066.58x = 2,107,645.61
5. Step 5: Solve for x
   x = 2,107,645.61/2,066.58
6. Step 6: Final answer
   x = 1,019.87