Finding the Fourth Proportional to 1,158.83, 1,599.31 and 661.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.83 : 1,599.31 = 661.56 : x
2. Step 2: Convert to fraction form
   1,158.83/1,599.31 = 661.56/x
3. Step 3: Cross multiply
   1,158.83x = 1,599.31 × 661.56
4. Step 4: Simplify right side
   1,158.83x = 1,058,039.52
5. Step 5: Solve for x
   x = 1,058,039.52/1,158.83
6. Step 6: Final answer
   x = 913.02