Finding the Fourth Proportional to 1,433.78, 1,978.25 and 874.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.78 : 1,978.25 = 874.19 : x
2. Step 2: Convert to fraction form
   1,433.78/1,978.25 = 874.19/x
3. Step 3: Cross multiply
   1,433.78x = 1,978.25 × 874.19
4. Step 4: Simplify right side
   1,433.78x = 1,729,369.40
5. Step 5: Solve for x
   x = 1,729,369.40/1,433.78
6. Step 6: Final answer
   x = 1,206.16