Finding the Fourth Proportional to 1,308.84, 1,963.52 and 443.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.84 : 1,963.52 = 443.12 : x
2. Step 2: Convert to fraction form
   1,308.84/1,963.52 = 443.12/x
3. Step 3: Cross multiply
   1,308.84x = 1,963.52 × 443.12
4. Step 4: Simplify right side
   1,308.84x = 870,074.98
5. Step 5: Solve for x
   x = 870,074.98/1,308.84
6. Step 6: Final answer
   x = 664.77