Finding the Fourth Proportional to 1,678.52, 2,316.38 and 979.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.52 : 2,316.38 = 979.89 : x
2. Step 2: Convert to fraction form
   1,678.52/2,316.38 = 979.89/x
3. Step 3: Cross multiply
   1,678.52x = 2,316.38 × 979.89
4. Step 4: Simplify right side
   1,678.52x = 2,269,797.60
5. Step 5: Solve for x
   x = 2,269,797.60/1,678.52
6. Step 6: Final answer
   x = 1,352.26