Finding the Fourth Proportional to 1,724.42, 2,379.48 and 978.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.42 : 2,379.48 = 978.38 : x
2. Step 2: Convert to fraction form
   1,724.42/2,379.48 = 978.38/x
3. Step 3: Cross multiply
   1,724.42x = 2,379.48 × 978.38
4. Step 4: Simplify right side
   1,724.42x = 2,328,035.64
5. Step 5: Solve for x
   x = 2,328,035.64/1,724.42
6. Step 6: Final answer
   x = 1,350.04