Finding the Fourth Proportional to 1,678.24, 2,315.82 and 979.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.24 : 2,315.82 = 979.48 : x
2. Step 2: Convert to fraction form
   1,678.24/2,315.82 = 979.48/x
3. Step 3: Cross multiply
   1,678.24x = 2,315.82 × 979.48
4. Step 4: Simplify right side
   1,678.24x = 2,268,299.37
5. Step 5: Solve for x
   x = 2,268,299.37/1,678.24
6. Step 6: Final answer
   x = 1,351.59