Finding the Fourth Proportional to 1,019.48, 1,406.88 and 553.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.48 : 1,406.88 = 553.73 : x
2. Step 2: Convert to fraction form
   1,019.48/1,406.88 = 553.73/x
3. Step 3: Cross multiply
   1,019.48x = 1,406.88 × 553.73
4. Step 4: Simplify right side
   1,019.48x = 779,031.66
5. Step 5: Solve for x
   x = 779,031.66/1,019.48
6. Step 6: Final answer
   x = 764.15