Finding the Fourth Proportional to 1,089.89, 1,631.07 and 673.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.89 : 1,631.07 = 673.25 : x
2. Step 2: Convert to fraction form
   1,089.89/1,631.07 = 673.25/x
3. Step 3: Cross multiply
   1,089.89x = 1,631.07 × 673.25
4. Step 4: Simplify right side
   1,089.89x = 1,098,109.72
5. Step 5: Solve for x
   x = 1,098,109.72/1,089.89
6. Step 6: Final answer
   x = 1,007.55