Finding the Fourth Proportional to 1,185.48, 1,636.02 and 661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.48 : 1,636.02 = 661.50 : x
2. Step 2: Convert to fraction form
   1,185.48/1,636.02 = 661.50/x
3. Step 3: Cross multiply
   1,185.48x = 1,636.02 × 661.50
4. Step 4: Simplify right side
   1,185.48x = 1,082,227.23
5. Step 5: Solve for x
   x = 1,082,227.23/1,185.48
6. Step 6: Final answer
   x = 912.90