Finding the Fourth Proportional to 1,185.14, 1,635.50 and 661.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.14 : 1,635.50 = 661.17 : x
2. Step 2: Convert to fraction form
   1,185.14/1,635.50 = 661.17/x
3. Step 3: Cross multiply
   1,185.14x = 1,635.50 × 661.17
4. Step 4: Simplify right side
   1,185.14x = 1,081,343.30
5. Step 5: Solve for x
   x = 1,081,343.30/1,185.14
6. Step 6: Final answer
   x = 912.42