Finding the Fourth Proportional to 1,185.89, 1,636.55 and 661.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.89 : 1,636.55 = 661.92 : x
2. Step 2: Convert to fraction form
   1,185.89/1,636.55 = 661.92/x
3. Step 3: Cross multiply
   1,185.89x = 1,636.55 × 661.92
4. Step 4: Simplify right side
   1,185.89x = 1,083,271.14
5. Step 5: Solve for x
   x = 1,083,271.14/1,185.89
6. Step 6: Final answer
   x = 913.47