Finding the Fourth Proportional to 1,019.29, 1,406.62 and 553.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.29 : 1,406.62 = 553.54 : x
2. Step 2: Convert to fraction form
   1,019.29/1,406.62 = 553.54/x
3. Step 3: Cross multiply
   1,019.29x = 1,406.62 × 553.54
4. Step 4: Simplify right side
   1,019.29x = 778,620.43
5. Step 5: Solve for x
   x = 778,620.43/1,019.29
6. Step 6: Final answer
   x = 763.89