Finding the Fourth Proportional to 1,419.23, 2,128.82 and 445.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.23 : 2,128.82 = 445.34 : x
2. Step 2: Convert to fraction form
   1,419.23/2,128.82 = 445.34/x
3. Step 3: Cross multiply
   1,419.23x = 2,128.82 × 445.34
4. Step 4: Simplify right side
   1,419.23x = 948,035.83
5. Step 5: Solve for x
   x = 948,035.83/1,419.23
6. Step 6: Final answer
   x = 668.00