Finding the Fourth Proportional to 1,838.78, 2,757.31 and 667.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,838.78 : 2,757.31 = 667.96 : x
2. Step 2: Convert to fraction form
   1,838.78/2,757.31 = 667.96/x
3. Step 3: Cross multiply
   1,838.78x = 2,757.31 × 667.96
4. Step 4: Simplify right side
   1,838.78x = 1,841,778.05
5. Step 5: Solve for x
   x = 1,841,778.05/1,838.78
6. Step 6: Final answer
   x = 1,001.63