Finding the Fourth Proportional to 1,185.81, 1,636.16 and 661.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.81 : 1,636.16 = 661.83 : x
2. Step 2: Convert to fraction form
   1,185.81/1,636.16 = 661.83/x
3. Step 3: Cross multiply
   1,185.81x = 1,636.16 × 661.83
4. Step 4: Simplify right side
   1,185.81x = 1,082,859.77
5. Step 5: Solve for x
   x = 1,082,859.77/1,185.81
6. Step 6: Final answer
   x = 913.18