Finding the Fourth Proportional to 1,185.93, 1,636.61 and 661.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.93 : 1,636.61 = 661.91 : x
2. Step 2: Convert to fraction form
   1,185.93/1,636.61 = 661.91/x
3. Step 3: Cross multiply
   1,185.93x = 1,636.61 × 661.91
4. Step 4: Simplify right side
   1,185.93x = 1,083,288.53
5. Step 5: Solve for x
   x = 1,083,288.53/1,185.93
6. Step 6: Final answer
   x = 913.45