Finding the Fourth Proportional to 1,185.29, 1,635.55 and 661.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.29 : 1,635.55 = 661.29 : x
2. Step 2: Convert to fraction form
   1,185.29/1,635.55 = 661.29/x
3. Step 3: Cross multiply
   1,185.29x = 1,635.55 × 661.29
4. Step 4: Simplify right side
   1,185.29x = 1,081,572.86
5. Step 5: Solve for x
   x = 1,081,572.86/1,185.29
6. Step 6: Final answer
   x = 912.50