Finding the Fourth Proportional to 1,724.40, 2,379.54 and 938.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.40 : 2,379.54 = 938.43 : x
2. Step 2: Convert to fraction form
   1,724.40/2,379.54 = 938.43/x
3. Step 3: Cross multiply
   1,724.40x = 2,379.54 × 938.43
4. Step 4: Simplify right side
   1,724.40x = 2,233,031.72
5. Step 5: Solve for x
   x = 2,233,031.72/1,724.40
6. Step 6: Final answer
   x = 1,294.96