Finding the Fourth Proportional to 1,019.33, 1,406.68 and 553.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.33 : 1,406.68 = 553.58 : x
2. Step 2: Convert to fraction form
   1,019.33/1,406.68 = 553.58/x
3. Step 3: Cross multiply
   1,019.33x = 1,406.68 × 553.58
4. Step 4: Simplify right side
   1,019.33x = 778,707.15
5. Step 5: Solve for x
   x = 778,707.15/1,019.33
6. Step 6: Final answer
   x = 763.94