Finding the Fourth Proportional to 1,185.50, 1,635.99 and 661.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.50 : 1,635.99 = 661.61 : x
2. Step 2: Convert to fraction form
   1,185.50/1,635.99 = 661.61/x
3. Step 3: Cross multiply
   1,185.50x = 1,635.99 × 661.61
4. Step 4: Simplify right side
   1,185.50x = 1,082,387.34
5. Step 5: Solve for x
   x = 1,082,387.34/1,185.50
6. Step 6: Final answer
   x = 913.02