Finding the Third Proportional to 2,479.78 and 4,228.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,479.78 : 4,228.45 = 4,228.45 : x
2. Step 2: Convert to fraction form
   2,479.78/4,228.45 = 4,228.45/x
3. Step 3: Cross multiply
   2,479.78x = 4,228.45 × 4,228.45
4. Step 4: Simplify right side
   2,479.78x = 17,879,815.83
5. Step 5: Solve for x
   x = 17,879,815.83/2,479.78
6. Step 6: Final answer
   x = 7,210.24