Finding the Fourth Proportional to 1,678.32, 2,315.34 and 979.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.32 : 2,315.34 = 979.38 : x
2. Step 2: Convert to fraction form
   1,678.32/2,315.34 = 979.38/x
3. Step 3: Cross multiply
   1,678.32x = 2,315.34 × 979.38
4. Step 4: Simplify right side
   1,678.32x = 2,267,597.69
5. Step 5: Solve for x
   x = 2,267,597.69/1,678.32
6. Step 6: Final answer
   x = 1,351.11