Finding the Fourth Proportional to 1,061.69, 1,591.49 and 445.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.69 : 1,591.49 = 445.57 : x
2. Step 2: Convert to fraction form
   1,061.69/1,591.49 = 445.57/x
3. Step 3: Cross multiply
   1,061.69x = 1,591.49 × 445.57
4. Step 4: Simplify right side
   1,061.69x = 709,120.20
5. Step 5: Solve for x
   x = 709,120.20/1,061.69
6. Step 6: Final answer
   x = 667.92