Finding the Fourth Proportional to 1,724.41, 2,379.31 and 978.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.41 : 2,379.31 = 978.31 : x
2. Step 2: Convert to fraction form
   1,724.41/2,379.31 = 978.31/x
3. Step 3: Cross multiply
   1,724.41x = 2,379.31 × 978.31
4. Step 4: Simplify right side
   1,724.41x = 2,327,702.77
5. Step 5: Solve for x
   x = 2,327,702.77/1,724.41
6. Step 6: Final answer
   x = 1,349.85