Finding the Fourth Proportional to 2,679.68, 4,019.49 and 830.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,679.68 : 4,019.49 = 830.72 : x
2. Step 2: Convert to fraction form
   2,679.68/4,019.49 = 830.72/x
3. Step 3: Cross multiply
   2,679.68x = 4,019.49 × 830.72
4. Step 4: Simplify right side
   2,679.68x = 3,339,080.78
5. Step 5: Solve for x
   x = 3,339,080.78/2,679.68
6. Step 6: Final answer
   x = 1,246.07