Finding the Fourth Proportional to 1,158.82, 1,599.33 and 661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.82 : 1,599.33 = 661.50 : x
2. Step 2: Convert to fraction form
   1,158.82/1,599.33 = 661.50/x
3. Step 3: Cross multiply
   1,158.82x = 1,599.33 × 661.50
4. Step 4: Simplify right side
   1,158.82x = 1,057,956.80
5. Step 5: Solve for x
   x = 1,057,956.80/1,158.82
6. Step 6: Final answer
   x = 912.96