Finding the Fourth Proportional to 1,018.78, 1,403.49 and 969.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.78 : 1,403.49 = 969.37 : x
2. Step 2: Convert to fraction form
   1,018.78/1,403.49 = 969.37/x
3. Step 3: Cross multiply
   1,018.78x = 1,403.49 × 969.37
4. Step 4: Simplify right side
   1,018.78x = 1,360,501.10
5. Step 5: Solve for x
   x = 1,360,501.10/1,018.78
6. Step 6: Final answer
   x = 1,335.42