Finding the Fourth Proportional to 1,158.51, 1,598.79 and 661.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.51 : 1,598.79 = 661.23 : x
2. Step 2: Convert to fraction form
   1,158.51/1,598.79 = 661.23/x
3. Step 3: Cross multiply
   1,158.51x = 1,598.79 × 661.23
4. Step 4: Simplify right side
   1,158.51x = 1,057,164.61
5. Step 5: Solve for x
   x = 1,057,164.61/1,158.51
6. Step 6: Final answer
   x = 912.52