Finding the Fourth Proportional to 1,724.28, 2,379.56 and 938.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.28 : 2,379.56 = 938.38 : x
2. Step 2: Convert to fraction form
   1,724.28/2,379.56 = 938.38/x
3. Step 3: Cross multiply
   1,724.28x = 2,379.56 × 938.38
4. Step 4: Simplify right side
   1,724.28x = 2,232,931.51
5. Step 5: Solve for x
   x = 2,232,931.51/1,724.28
6. Step 6: Final answer
   x = 1,294.99