Finding the Fourth Proportional to 1,185.43, 1,635.94 and 661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.43 : 1,635.94 = 661.50 : x
2. Step 2: Convert to fraction form
   1,185.43/1,635.94 = 661.50/x
3. Step 3: Cross multiply
   1,185.43x = 1,635.94 × 661.50
4. Step 4: Simplify right side
   1,185.43x = 1,082,174.31
5. Step 5: Solve for x
   x = 1,082,174.31/1,185.43
6. Step 6: Final answer
   x = 912.90