Finding the Fourth Proportional to 1,724.05, 2,379.18 and 978.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.05 : 2,379.18 = 978.04 : x
2. Step 2: Convert to fraction form
   1,724.05/2,379.18 = 978.04/x
3. Step 3: Cross multiply
   1,724.05x = 2,379.18 × 978.04
4. Step 4: Simplify right side
   1,724.05x = 2,326,933.21
5. Step 5: Solve for x
   x = 2,326,933.21/1,724.05
6. Step 6: Final answer
   x = 1,349.69