Finding the Fourth Proportional to 1,093.32, 1,640.16 and 443.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,093.32 : 1,640.16 = 443.88 : x
2. Step 2: Convert to fraction form
   1,093.32/1,640.16 = 443.88/x
3. Step 3: Cross multiply
   1,093.32x = 1,640.16 × 443.88
4. Step 4: Simplify right side
   1,093.32x = 728,034.22
5. Step 5: Solve for x
   x = 728,034.22/1,093.32
6. Step 6: Final answer
   x = 665.89