Finding the Fourth Proportional to 1,724.55, 2,379.74 and 978.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.55 : 2,379.74 = 978.33 : x
2. Step 2: Convert to fraction form
   1,724.55/2,379.74 = 978.33/x
3. Step 3: Cross multiply
   1,724.55x = 2,379.74 × 978.33
4. Step 4: Simplify right side
   1,724.55x = 2,328,171.03
5. Step 5: Solve for x
   x = 2,328,171.03/1,724.55
6. Step 6: Final answer
   x = 1,350.02