Finding the Fourth Proportional to 1,158.59, 1,598.95 and 661.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.59 : 1,598.95 = 661.25 : x
2. Step 2: Convert to fraction form
   1,158.59/1,598.95 = 661.25/x
3. Step 3: Cross multiply
   1,158.59x = 1,598.95 × 661.25
4. Step 4: Simplify right side
   1,158.59x = 1,057,305.69
5. Step 5: Solve for x
   x = 1,057,305.69/1,158.59
6. Step 6: Final answer
   x = 912.58