Finding the Fourth Proportional to 1,185.12, 1,635.27 and 661.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.12 : 1,635.27 = 661.15 : x
2. Step 2: Convert to fraction form
   1,185.12/1,635.27 = 661.15/x
3. Step 3: Cross multiply
   1,185.12x = 1,635.27 × 661.15
4. Step 4: Simplify right side
   1,185.12x = 1,081,158.76
5. Step 5: Solve for x
   x = 1,081,158.76/1,185.12
6. Step 6: Final answer
   x = 912.28