Finding the Fourth Proportional to 1,222.99, 1,834.49 and 443.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.99 : 1,834.49 = 443.10 : x
2. Step 2: Convert to fraction form
   1,222.99/1,834.49 = 443.10/x
3. Step 3: Cross multiply
   1,222.99x = 1,834.49 × 443.10
4. Step 4: Simplify right side
   1,222.99x = 812,851.13
5. Step 5: Solve for x
   x = 812,851.13/1,222.99
6. Step 6: Final answer
   x = 664.64