Finding the Fourth Proportional to 1,039.49, 1,559.18 and 628.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.49 : 1,559.18 = 628.52 : x
2. Step 2: Convert to fraction form
   1,039.49/1,559.18 = 628.52/x
3. Step 3: Cross multiply
   1,039.49x = 1,559.18 × 628.52
4. Step 4: Simplify right side
   1,039.49x = 979,978.36
5. Step 5: Solve for x
   x = 979,978.36/1,039.49
6. Step 6: Final answer
   x = 942.75