Finding the Fourth Proportional to 1,019.30, 1,406.61 and 577.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.30 : 1,406.61 = 577.19 : x
2. Step 2: Convert to fraction form
   1,019.30/1,406.61 = 577.19/x
3. Step 3: Cross multiply
   1,019.30x = 1,406.61 × 577.19
4. Step 4: Simplify right side
   1,019.30x = 811,874.19
5. Step 5: Solve for x
   x = 811,874.19/1,019.30
6. Step 6: Final answer
   x = 796.51