Finding the Fourth Proportional to 1,185.42, 1,635.72 and 661.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.42 : 1,635.72 = 661.34 : x
2. Step 2: Convert to fraction form
   1,185.42/1,635.72 = 661.34/x
3. Step 3: Cross multiply
   1,185.42x = 1,635.72 × 661.34
4. Step 4: Simplify right side
   1,185.42x = 1,081,767.06
5. Step 5: Solve for x
   x = 1,081,767.06/1,185.42
6. Step 6: Final answer
   x = 912.56