Finding the Fourth Proportional to 1,724.69, 2,380.10 and 978.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.69 : 2,380.10 = 978.59 : x
2. Step 2: Convert to fraction form
   1,724.69/2,380.10 = 978.59/x
3. Step 3: Cross multiply
   1,724.69x = 2,380.10 × 978.59
4. Step 4: Simplify right side
   1,724.69x = 2,329,142.06
5. Step 5: Solve for x
   x = 2,329,142.06/1,724.69
6. Step 6: Final answer
   x = 1,350.47