Finding the Fourth Proportional to 1,724.43, 2,379.75 and 978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.43 : 2,379.75 = 978.42 : x
2. Step 2: Convert to fraction form
   1,724.43/2,379.75 = 978.42/x
3. Step 3: Cross multiply
   1,724.43x = 2,379.75 × 978.42
4. Step 4: Simplify right side
   1,724.43x = 2,328,395.00
5. Step 5: Solve for x
   x = 2,328,395.00/1,724.43
6. Step 6: Final answer
   x = 1,350.24