Finding the Fourth Proportional to 1,158.69, 1,598.31 and 661.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.69 : 1,598.31 = 661.23 : x
2. Step 2: Convert to fraction form
   1,158.69/1,598.31 = 661.23/x
3. Step 3: Cross multiply
   1,158.69x = 1,598.31 × 661.23
4. Step 4: Simplify right side
   1,158.69x = 1,056,850.52
5. Step 5: Solve for x
   x = 1,056,850.52/1,158.69
6. Step 6: Final answer
   x = 912.11