Finding the Fourth Proportional to 1,185.16, 1,635.54 and 661.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.16 : 1,635.54 = 661.22 : x
2. Step 2: Convert to fraction form
   1,185.16/1,635.54 = 661.22/x
3. Step 3: Cross multiply
   1,185.16x = 1,635.54 × 661.22
4. Step 4: Simplify right side
   1,185.16x = 1,081,451.76
5. Step 5: Solve for x
   x = 1,081,451.76/1,185.16
6. Step 6: Final answer
   x = 912.49