Finding the Fourth Proportional to 1,678.17, 2,315.83 and 979.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.17 : 2,315.83 = 979.50 : x
2. Step 2: Convert to fraction form
   1,678.17/2,315.83 = 979.50/x
3. Step 3: Cross multiply
   1,678.17x = 2,315.83 × 979.50
4. Step 4: Simplify right side
   1,678.17x = 2,268,355.49
5. Step 5: Solve for x
   x = 2,268,355.49/1,678.17
6. Step 6: Final answer
   x = 1,351.68