Finding the Fourth Proportional to 1,724.96, 2,380.04 and 978.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.96 : 2,380.04 = 978.75 : x
2. Step 2: Convert to fraction form
   1,724.96/2,380.04 = 978.75/x
3. Step 3: Cross multiply
   1,724.96x = 2,380.04 × 978.75
4. Step 4: Simplify right side
   1,724.96x = 2,329,464.15
5. Step 5: Solve for x
   x = 2,329,464.15/1,724.96
6. Step 6: Final answer
   x = 1,350.45