Finding the Fourth Proportional to 2,456.40, 3,679.20 and 1,479

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.40 : 3,679.20 = 1,479 : x
2. Step 2: Convert to fraction form
   2,456.40/3,679.20 = 1,479/x
3. Step 3: Cross multiply
   2,456.40x = 3,679.20 × 1,479
4. Step 4: Simplify right side
   2,456.40x = 5,441,536.80
5. Step 5: Solve for x
   x = 5,441,536.80/2,456.40
6. Step 6: Final answer
   x = 2,215.25