Finding the Fourth Proportional to 1,185.07, 1,635.40 and 661.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.07 : 1,635.40 = 661.12 : x
2. Step 2: Convert to fraction form
   1,185.07/1,635.40 = 661.12/x
3. Step 3: Cross multiply
   1,185.07x = 1,635.40 × 661.12
4. Step 4: Simplify right side
   1,185.07x = 1,081,189.91
5. Step 5: Solve for x
   x = 1,081,189.91/1,185.07
6. Step 6: Final answer
   x = 912.34