Finding the Fourth Proportional to 1,185.38, 1,635.72 and 661.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.38 : 1,635.72 = 661.38 : x
2. Step 2: Convert to fraction form
   1,185.38/1,635.72 = 661.38/x
3. Step 3: Cross multiply
   1,185.38x = 1,635.72 × 661.38
4. Step 4: Simplify right side
   1,185.38x = 1,081,825.97
5. Step 5: Solve for x
   x = 1,081,825.97/1,185.38
6. Step 6: Final answer
   x = 912.64