Finding the Fourth Proportional to 1,166.96, 1,610.55 and 669.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,166.96 : 1,610.55 = 669.50 : x
2. Step 2: Convert to fraction form
   1,166.96/1,610.55 = 669.50/x
3. Step 3: Cross multiply
   1,166.96x = 1,610.55 × 669.50
4. Step 4: Simplify right side
   1,166.96x = 1,078,255.17
5. Step 5: Solve for x
   x = 1,078,255.17/1,166.96
6. Step 6: Final answer
   x = 923.99