Finding the Fourth Proportional to 2,679.72, 4,019.96 and 830.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,679.72 : 4,019.96 = 830.96 : x
2. Step 2: Convert to fraction form
   2,679.72/4,019.96 = 830.96/x
3. Step 3: Cross multiply
   2,679.72x = 4,019.96 × 830.96
4. Step 4: Simplify right side
   2,679.72x = 3,340,423.01
5. Step 5: Solve for x
   x = 3,340,423.01/2,679.72
6. Step 6: Final answer
   x = 1,246.56