Finding the Fourth Proportional to 1,185.86, 1,636.52 and 661.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.86 : 1,636.52 = 661.88 : x
2. Step 2: Convert to fraction form
   1,185.86/1,636.52 = 661.88/x
3. Step 3: Cross multiply
   1,185.86x = 1,636.52 × 661.88
4. Step 4: Simplify right side
   1,185.86x = 1,083,168.37
5. Step 5: Solve for x
   x = 1,083,168.37/1,185.86
6. Step 6: Final answer
   x = 913.41