Finding the Fourth Proportional to 1,724.78, 2,380.20 and 938.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.78 : 2,380.20 = 938.83 : x
2. Step 2: Convert to fraction form
   1,724.78/2,380.20 = 938.83/x
3. Step 3: Cross multiply
   1,724.78x = 2,380.20 × 938.83
4. Step 4: Simplify right side
   1,724.78x = 2,234,603.17
5. Step 5: Solve for x
   x = 2,234,603.17/1,724.78
6. Step 6: Final answer
   x = 1,295.59