Finding the Fourth Proportional to 1,185.03, 1,635.38 and 661.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.03 : 1,635.38 = 661.05 : x
2. Step 2: Convert to fraction form
   1,185.03/1,635.38 = 661.05/x
3. Step 3: Cross multiply
   1,185.03x = 1,635.38 × 661.05
4. Step 4: Simplify right side
   1,185.03x = 1,081,064.64
5. Step 5: Solve for x
   x = 1,081,064.64/1,185.03
6. Step 6: Final answer
   x = 912.27