Finding the Fourth Proportional to 1,061.34, 1,590.86 and 445.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.34 : 1,590.86 = 445.38 : x
2. Step 2: Convert to fraction form
   1,061.34/1,590.86 = 445.38/x
3. Step 3: Cross multiply
   1,061.34x = 1,590.86 × 445.38
4. Step 4: Simplify right side
   1,061.34x = 708,527.05
5. Step 5: Solve for x
   x = 708,527.05/1,061.34
6. Step 6: Final answer
   x = 667.58