Finding the Fourth Proportional to 1,185.23, 1,635.80 and 661.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.23 : 1,635.80 = 661.37 : x
2. Step 2: Convert to fraction form
   1,185.23/1,635.80 = 661.37/x
3. Step 3: Cross multiply
   1,185.23x = 1,635.80 × 661.37
4. Step 4: Simplify right side
   1,185.23x = 1,081,857.56
5. Step 5: Solve for x
   x = 1,081,857.56/1,185.23
6. Step 6: Final answer
   x = 912.78