Finding the Fourth Proportional to 2,066.18, 3,099.12 and 679.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,066.18 : 3,099.12 = 679.50 : x
2. Step 2: Convert to fraction form
   2,066.18/3,099.12 = 679.50/x
3. Step 3: Cross multiply
   2,066.18x = 3,099.12 × 679.50
4. Step 4: Simplify right side
   2,066.18x = 2,105,852.04
5. Step 5: Solve for x
   x = 2,105,852.04/2,066.18
6. Step 6: Final answer
   x = 1,019.20