Finding the Fourth Proportional to 1,724.58, 2,379.81 and 978.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.58 : 2,379.81 = 978.48 : x
2. Step 2: Convert to fraction form
   1,724.58/2,379.81 = 978.48/x
3. Step 3: Cross multiply
   1,724.58x = 2,379.81 × 978.48
4. Step 4: Simplify right side
   1,724.58x = 2,328,596.49
5. Step 5: Solve for x
   x = 2,328,596.49/1,724.58
6. Step 6: Final answer
   x = 1,350.24