Finding the Fourth Proportional to 1,158.53, 1,598.81 and 661.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.53 : 1,598.81 = 661.16 : x
2. Step 2: Convert to fraction form
   1,158.53/1,598.81 = 661.16/x
3. Step 3: Cross multiply
   1,158.53x = 1,598.81 × 661.16
4. Step 4: Simplify right side
   1,158.53x = 1,057,069.22
5. Step 5: Solve for x
   x = 1,057,069.22/1,158.53
6. Step 6: Final answer
   x = 912.42