Finding the Fourth Proportional to 1,185.93, 1,636.56 and 661.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.93 : 1,636.56 = 661.95 : x
2. Step 2: Convert to fraction form
   1,185.93/1,636.56 = 661.95/x
3. Step 3: Cross multiply
   1,185.93x = 1,636.56 × 661.95
4. Step 4: Simplify right side
   1,185.93x = 1,083,320.89
5. Step 5: Solve for x
   x = 1,083,320.89/1,185.93
6. Step 6: Final answer
   x = 913.48