Finding the Fourth Proportional to 1,152.05, 1,589.83 and 628.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.05 : 1,589.83 = 628.09 : x
2. Step 2: Convert to fraction form
   1,152.05/1,589.83 = 628.09/x
3. Step 3: Cross multiply
   1,152.05x = 1,589.83 × 628.09
4. Step 4: Simplify right side
   1,152.05x = 998,556.32
5. Step 5: Solve for x
   x = 998,556.32/1,152.05
6. Step 6: Final answer
   x = 866.76