Finding the Fourth Proportional to 1,158.96, 1,599.33 and 661.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.96 : 1,599.33 = 661.53 : x
2. Step 2: Convert to fraction form
   1,158.96/1,599.33 = 661.53/x
3. Step 3: Cross multiply
   1,158.96x = 1,599.33 × 661.53
4. Step 4: Simplify right side
   1,158.96x = 1,058,004.77
5. Step 5: Solve for x
   x = 1,058,004.77/1,158.96
6. Step 6: Final answer
   x = 912.89