Finding the Fourth Proportional to 1,724.37, 2,379.24 and 978.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.37 : 2,379.24 = 978.15 : x
2. Step 2: Convert to fraction form
   1,724.37/2,379.24 = 978.15/x
3. Step 3: Cross multiply
   1,724.37x = 2,379.24 × 978.15
4. Step 4: Simplify right side
   1,724.37x = 2,327,253.61
5. Step 5: Solve for x
   x = 2,327,253.61/1,724.37
6. Step 6: Final answer
   x = 1,349.63