Finding the Fourth Proportional to 1,078.89, 1,609.99 and 962.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.89 : 1,609.99 = 962.40 : x
2. Step 2: Convert to fraction form
   1,078.89/1,609.99 = 962.40/x
3. Step 3: Cross multiply
   1,078.89x = 1,609.99 × 962.40
4. Step 4: Simplify right side
   1,078.89x = 1,549,454.38
5. Step 5: Solve for x
   x = 1,549,454.38/1,078.89
6. Step 6: Final answer
   x = 1,436.16