Finding the Fourth Proportional to 1,019.69, 1,407.17 and 553.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.69 : 1,407.17 = 553.94 : x
2. Step 2: Convert to fraction form
   1,019.69/1,407.17 = 553.94/x
3. Step 3: Cross multiply
   1,019.69x = 1,407.17 × 553.94
4. Step 4: Simplify right side
   1,019.69x = 779,487.75
5. Step 5: Solve for x
   x = 779,487.75/1,019.69
6. Step 6: Final answer
   x = 764.44