Finding the Fourth Proportional to 1,940.78, 2,678.31 and 1,101.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,940.78 : 2,678.31 = 1,101.47 : x
2. Step 2: Convert to fraction form
   1,940.78/2,678.31 = 1,101.47/x
3. Step 3: Cross multiply
   1,940.78x = 2,678.31 × 1,101.47
4. Step 4: Simplify right side
   1,940.78x = 2,950,078.12
5. Step 5: Solve for x
   x = 2,950,078.12/1,940.78
6. Step 6: Final answer
   x = 1,520.05