Finding the Fourth Proportional to 1,724.75, 2,380.23 and 978.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.75 : 2,380.23 = 978.71 : x
2. Step 2: Convert to fraction form
   1,724.75/2,380.23 = 978.71/x
3. Step 3: Cross multiply
   1,724.75x = 2,380.23 × 978.71
4. Step 4: Simplify right side
   1,724.75x = 2,329,554.90
5. Step 5: Solve for x
   x = 2,329,554.90/1,724.75
6. Step 6: Final answer
   x = 1,350.66