Finding the Fourth Proportional to 2,679.08, 4,018.38 and 830.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,679.08 : 4,018.38 = 830.15 : x
2. Step 2: Convert to fraction form
   2,679.08/4,018.38 = 830.15/x
3. Step 3: Cross multiply
   2,679.08x = 4,018.38 × 830.15
4. Step 4: Simplify right side
   2,679.08x = 3,335,857.03
5. Step 5: Solve for x
   x = 3,335,857.03/2,679.08
6. Step 6: Final answer
   x = 1,245.15