Finding the Fourth Proportional to 1,724.31, 2,379.15 and 978.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.31 : 2,379.15 = 978.03 : x
2. Step 2: Convert to fraction form
   1,724.31/2,379.15 = 978.03/x
3. Step 3: Cross multiply
   1,724.31x = 2,379.15 × 978.03
4. Step 4: Simplify right side
   1,724.31x = 2,326,880.07
5. Step 5: Solve for x
   x = 2,326,880.07/1,724.31
6. Step 6: Final answer
   x = 1,349.46