Finding the Fourth Proportional to 1,019.52, 1,406.90 and 553.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.52 : 1,406.90 = 553.76 : x
2. Step 2: Convert to fraction form
   1,019.52/1,406.90 = 553.76/x
3. Step 3: Cross multiply
   1,019.52x = 1,406.90 × 553.76
4. Step 4: Simplify right side
   1,019.52x = 779,084.94
5. Step 5: Solve for x
   x = 779,084.94/1,019.52
6. Step 6: Final answer
   x = 764.17