Finding the Fourth Proportional to 1,367.68, 2,051.31 and 443.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.68 : 2,051.31 = 443.31 : x
2. Step 2: Convert to fraction form
   1,367.68/2,051.31 = 443.31/x
3. Step 3: Cross multiply
   1,367.68x = 2,051.31 × 443.31
4. Step 4: Simplify right side
   1,367.68x = 909,376.89
5. Step 5: Solve for x
   x = 909,376.89/1,367.68
6. Step 6: Final answer
   x = 664.91