Finding the Fourth Proportional to 1,061.40, 1,591.44 and 445.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.40 : 1,591.44 = 445.50 : x
2. Step 2: Convert to fraction form
   1,061.40/1,591.44 = 445.50/x
3. Step 3: Cross multiply
   1,061.40x = 1,591.44 × 445.50
4. Step 4: Simplify right side
   1,061.40x = 708,986.52
5. Step 5: Solve for x
   x = 708,986.52/1,061.40
6. Step 6: Final answer
   x = 667.97