Finding the Fourth Proportional to 1,185.32, 1,635.72 and 661.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.32 : 1,635.72 = 661.35 : x
2. Step 2: Convert to fraction form
   1,185.32/1,635.72 = 661.35/x
3. Step 3: Cross multiply
   1,185.32x = 1,635.72 × 661.35
4. Step 4: Simplify right side
   1,185.32x = 1,081,783.42
5. Step 5: Solve for x
   x = 1,081,783.42/1,185.32
6. Step 6: Final answer
   x = 912.65