Finding the Fourth Proportional to 1,185.59, 1,636.17 and 661.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.59 : 1,636.17 = 661.63 : x
2. Step 2: Convert to fraction form
   1,185.59/1,636.17 = 661.63/x
3. Step 3: Cross multiply
   1,185.59x = 1,636.17 × 661.63
4. Step 4: Simplify right side
   1,185.59x = 1,082,539.16
5. Step 5: Solve for x
   x = 1,082,539.16/1,185.59
6. Step 6: Final answer
   x = 913.08