Finding the Fourth Proportional to 1,158.62, 1,599.01 and 661.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.62 : 1,599.01 = 661.33 : x
2. Step 2: Convert to fraction form
   1,158.62/1,599.01 = 661.33/x
3. Step 3: Cross multiply
   1,158.62x = 1,599.01 × 661.33
4. Step 4: Simplify right side
   1,158.62x = 1,057,476.81
5. Step 5: Solve for x
   x = 1,057,476.81/1,158.62
6. Step 6: Final answer
   x = 912.70