Finding the Fourth Proportional to 1,166.89, 1,609.99 and 669.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,166.89 : 1,609.99 = 669.50 : x
2. Step 2: Convert to fraction form
   1,166.89/1,609.99 = 669.50/x
3. Step 3: Cross multiply
   1,166.89x = 1,609.99 × 669.50
4. Step 4: Simplify right side
   1,166.89x = 1,077,892.35
5. Step 5: Solve for x
   x = 1,077,892.35/1,166.89
6. Step 6: Final answer
   x = 923.73