Finding the Fourth Proportional to 1,185.49, 1,635.81 and 661.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.49 : 1,635.81 = 661.55 : x
2. Step 2: Convert to fraction form
   1,185.49/1,635.81 = 661.55/x
3. Step 3: Cross multiply
   1,185.49x = 1,635.81 × 661.55
4. Step 4: Simplify right side
   1,185.49x = 1,082,170.11
5. Step 5: Solve for x
   x = 1,082,170.11/1,185.49
6. Step 6: Final answer
   x = 912.85