Finding the Fourth Proportional to 1,185.45, 1,635.82 and 661.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.45 : 1,635.82 = 661.38 : x
2. Step 2: Convert to fraction form
   1,185.45/1,635.82 = 661.38/x
3. Step 3: Cross multiply
   1,185.45x = 1,635.82 × 661.38
4. Step 4: Simplify right side
   1,185.45x = 1,081,898.63
5. Step 5: Solve for x
   x = 1,081,898.63/1,185.45
6. Step 6: Final answer
   x = 912.65