Finding the Fourth Proportional to 1,724.49, 2,379.95 and 978.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.49 : 2,379.95 = 978.69 : x
2. Step 2: Convert to fraction form
   1,724.49/2,379.95 = 978.69/x
3. Step 3: Cross multiply
   1,724.49x = 2,379.95 × 978.69
4. Step 4: Simplify right side
   1,724.49x = 2,329,228.37
5. Step 5: Solve for x
   x = 2,329,228.37/1,724.49
6. Step 6: Final answer
   x = 1,350.68