Finding the Fourth Proportional to 1,095.05, 1,642.17 and 445.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,095.05 : 1,642.17 = 445.57 : x
2. Step 2: Convert to fraction form
   1,095.05/1,642.17 = 445.57/x
3. Step 3: Cross multiply
   1,095.05x = 1,642.17 × 445.57
4. Step 4: Simplify right side
   1,095.05x = 731,701.69
5. Step 5: Solve for x
   x = 731,701.69/1,095.05
6. Step 6: Final answer
   x = 668.19