Finding the Fourth Proportional to 1,185.41, 1,635.87 and 661.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.41 : 1,635.87 = 661.47 : x
2. Step 2: Convert to fraction form
   1,185.41/1,635.87 = 661.47/x
3. Step 3: Cross multiply
   1,185.41x = 1,635.87 × 661.47
4. Step 4: Simplify right side
   1,185.41x = 1,082,078.93
5. Step 5: Solve for x
   x = 1,082,078.93/1,185.41
6. Step 6: Final answer
   x = 912.83