Finding the Fourth Proportional to 1,061.50, 1,591.16 and 445.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.50 : 1,591.16 = 445.54 : x
2. Step 2: Convert to fraction form
   1,061.50/1,591.16 = 445.54/x
3. Step 3: Cross multiply
   1,061.50x = 1,591.16 × 445.54
4. Step 4: Simplify right side
   1,061.50x = 708,925.43
5. Step 5: Solve for x
   x = 708,925.43/1,061.50
6. Step 6: Final answer
   x = 667.85