Finding the Fourth Proportional to 1,185.30, 1,635.68 and 661.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.30 : 1,635.68 = 661.32 : x
2. Step 2: Convert to fraction form
   1,185.30/1,635.68 = 661.32/x
3. Step 3: Cross multiply
   1,185.30x = 1,635.68 × 661.32
4. Step 4: Simplify right side
   1,185.30x = 1,081,707.90
5. Step 5: Solve for x
   x = 1,081,707.90/1,185.30
6. Step 6: Final answer
   x = 912.60