Finding the Fourth Proportional to 1,436.40, 1,980.18 and 963.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.40 : 1,980.18 = 963.45 : x
2. Step 2: Convert to fraction form
   1,436.40/1,980.18 = 963.45/x
3. Step 3: Cross multiply
   1,436.40x = 1,980.18 × 963.45
4. Step 4: Simplify right side
   1,436.40x = 1,907,804.42
5. Step 5: Solve for x
   x = 1,907,804.42/1,436.40
6. Step 6: Final answer
   x = 1,328.18