Finding the Fourth Proportional to 1,185.58, 1,635.72 and 661.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.58 : 1,635.72 = 661.51 : x
2. Step 2: Convert to fraction form
   1,185.58/1,635.72 = 661.51/x
3. Step 3: Cross multiply
   1,185.58x = 1,635.72 × 661.51
4. Step 4: Simplify right side
   1,185.58x = 1,082,037.74
5. Step 5: Solve for x
   x = 1,082,037.74/1,185.58
6. Step 6: Final answer
   x = 912.67