Finding the Fourth Proportional to 1,276.48, 1,913.86 and 443.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.48 : 1,913.86 = 443.33 : x
2. Step 2: Convert to fraction form
   1,276.48/1,913.86 = 443.33/x
3. Step 3: Cross multiply
   1,276.48x = 1,913.86 × 443.33
4. Step 4: Simplify right side
   1,276.48x = 848,469.72
5. Step 5: Solve for x
   x = 848,469.72/1,276.48
6. Step 6: Final answer
   x = 664.69