Finding the Fourth Proportional to 2,679.69, 4,019.91 and 830.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,679.69 : 4,019.91 = 830.94 : x
2. Step 2: Convert to fraction form
   2,679.69/4,019.91 = 830.94/x
3. Step 3: Cross multiply
   2,679.69x = 4,019.91 × 830.94
4. Step 4: Simplify right side
   2,679.69x = 3,340,304.02
5. Step 5: Solve for x
   x = 3,340,304.02/2,679.69
6. Step 6: Final answer
   x = 1,246.53