Finding the Fourth Proportional to 2,623.20, 3,932.28 and 979.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,623.20 : 3,932.28 = 979.08 : x
2. Step 2: Convert to fraction form
   2,623.20/3,932.28 = 979.08/x
3. Step 3: Cross multiply
   2,623.20x = 3,932.28 × 979.08
4. Step 4: Simplify right side
   2,623.20x = 3,850,016.70
5. Step 5: Solve for x
   x = 3,850,016.70/2,623.20
6. Step 6: Final answer
   x = 1,467.68