Finding the Fourth Proportional to 1,185.06, 1,635.46 and 661.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.06 : 1,635.46 = 661.10 : x
2. Step 2: Convert to fraction form
   1,185.06/1,635.46 = 661.10/x
3. Step 3: Cross multiply
   1,185.06x = 1,635.46 × 661.10
4. Step 4: Simplify right side
   1,185.06x = 1,081,202.61
5. Step 5: Solve for x
   x = 1,081,202.61/1,185.06
6. Step 6: Final answer
   x = 912.36