Finding the Fourth Proportional to 1,061.74, 1,591.53 and 445.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.74 : 1,591.53 = 445.15 : x
2. Step 2: Convert to fraction form
   1,061.74/1,591.53 = 445.15/x
3. Step 3: Cross multiply
   1,061.74x = 1,591.53 × 445.15
4. Step 4: Simplify right side
   1,061.74x = 708,469.58
5. Step 5: Solve for x
   x = 708,469.58/1,061.74
6. Step 6: Final answer
   x = 667.27