Finding the Fourth Proportional to 1,019.46, 1,406.87 and 553.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.46 : 1,406.87 = 553.71 : x
2. Step 2: Convert to fraction form
   1,019.46/1,406.87 = 553.71/x
3. Step 3: Cross multiply
   1,019.46x = 1,406.87 × 553.71
4. Step 4: Simplify right side
   1,019.46x = 778,995.22
5. Step 5: Solve for x
   x = 778,995.22/1,019.46
6. Step 6: Final answer
   x = 764.13