Finding the Fourth Proportional to 1,019.58, 1,406.98 and 553.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.58 : 1,406.98 = 553.82 : x
2. Step 2: Convert to fraction form
   1,019.58/1,406.98 = 553.82/x
3. Step 3: Cross multiply
   1,019.58x = 1,406.98 × 553.82
4. Step 4: Simplify right side
   1,019.58x = 779,213.66
5. Step 5: Solve for x
   x = 779,213.66/1,019.58
6. Step 6: Final answer
   x = 764.25