Finding the Fourth Proportional to 1,096.78, 1,645.02 and 447.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,096.78 : 1,645.02 = 447.37 : x
2. Step 2: Convert to fraction form
   1,096.78/1,645.02 = 447.37/x
3. Step 3: Cross multiply
   1,096.78x = 1,645.02 × 447.37
4. Step 4: Simplify right side
   1,096.78x = 735,932.60
5. Step 5: Solve for x
   x = 735,932.60/1,096.78
6. Step 6: Final answer
   x = 670.99