Finding the Fourth Proportional to 1,019.44, 1,406.83 and 553.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.44 : 1,406.83 = 553.69 : x
2. Step 2: Convert to fraction form
   1,019.44/1,406.83 = 553.69/x
3. Step 3: Cross multiply
   1,019.44x = 1,406.83 × 553.69
4. Step 4: Simplify right side
   1,019.44x = 778,942.80
5. Step 5: Solve for x
   x = 778,942.80/1,019.44
6. Step 6: Final answer
   x = 764.09