Finding the Fourth Proportional to 1,223.72, 1,835.10 and 443.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223.72 : 1,835.10 = 443.57 : x
2. Step 2: Convert to fraction form
   1,223.72/1,835.10 = 443.57/x
3. Step 3: Cross multiply
   1,223.72x = 1,835.10 × 443.57
4. Step 4: Simplify right side
   1,223.72x = 813,995.31
5. Step 5: Solve for x
   x = 813,995.31/1,223.72
6. Step 6: Final answer
   x = 665.18