Finding the Fourth Proportional to 1,242.78, 1,714.98 and 683.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.78 : 1,714.98 = 683.25 : x
2. Step 2: Convert to fraction form
   1,242.78/1,714.98 = 683.25/x
3. Step 3: Cross multiply
   1,242.78x = 1,714.98 × 683.25
4. Step 4: Simplify right side
   1,242.78x = 1,171,760.09
5. Step 5: Solve for x
   x = 1,171,760.09/1,242.78
6. Step 6: Final answer
   x = 942.85