Finding the Fourth Proportional to 1,019.27, 1,406.56 and 553.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.27 : 1,406.56 = 553.51 : x
2. Step 2: Convert to fraction form
   1,019.27/1,406.56 = 553.51/x
3. Step 3: Cross multiply
   1,019.27x = 1,406.56 × 553.51
4. Step 4: Simplify right side
   1,019.27x = 778,542.26
5. Step 5: Solve for x
   x = 778,542.26/1,019.27
6. Step 6: Final answer
   x = 763.82