Finding the Fourth Proportional to 1,093.32, 1,638.72 and 443.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,093.32 : 1,638.72 = 443.25 : x
2. Step 2: Convert to fraction form
   1,093.32/1,638.72 = 443.25/x
3. Step 3: Cross multiply
   1,093.32x = 1,638.72 × 443.25
4. Step 4: Simplify right side
   1,093.32x = 726,362.64
5. Step 5: Solve for x
   x = 726,362.64/1,093.32
6. Step 6: Final answer
   x = 664.36