Finding the Fourth Proportional to 1,028.49, 1,419.31 and 556.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,028.49 : 1,419.31 = 556.38 : x
2. Step 2: Convert to fraction form
   1,028.49/1,419.31 = 556.38/x
3. Step 3: Cross multiply
   1,028.49x = 1,419.31 × 556.38
4. Step 4: Simplify right side
   1,028.49x = 789,677.86
5. Step 5: Solve for x
   x = 789,677.86/1,028.49
6. Step 6: Final answer
   x = 767.81