Finding the Fourth Proportional to 1,724.18, 2,379.43 and 978.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.18 : 2,379.43 = 978.17 : x
2. Step 2: Convert to fraction form
   1,724.18/2,379.43 = 978.17/x
3. Step 3: Cross multiply
   1,724.18x = 2,379.43 × 978.17
4. Step 4: Simplify right side
   1,724.18x = 2,327,488.71
5. Step 5: Solve for x
   x = 2,327,488.71/1,724.18
6. Step 6: Final answer
   x = 1,349.91