Finding the Fourth Proportional to 1,433.33, 1,978.08 and 1,078.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.33 : 1,978.08 = 1,078.61 : x
2. Step 2: Convert to fraction form
   1,433.33/1,978.08 = 1,078.61/x
3. Step 3: Cross multiply
   1,433.33x = 1,978.08 × 1,078.61
4. Step 4: Simplify right side
   1,433.33x = 2,133,581.48
5. Step 5: Solve for x
   x = 2,133,581.48/1,433.33
6. Step 6: Final answer
   x = 1,488.55