Finding the Fourth Proportional to 2,066.21, 3,099.50 and 679.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,066.21 : 3,099.50 = 679.55 : x
2. Step 2: Convert to fraction form
   2,066.21/3,099.50 = 679.55/x
3. Step 3: Cross multiply
   2,066.21x = 3,099.50 × 679.55
4. Step 4: Simplify right side
   2,066.21x = 2,106,246.33
5. Step 5: Solve for x
   x = 2,106,246.33/2,066.21
6. Step 6: Final answer
   x = 1,019.38