Finding the Fourth Proportional to 1,019.57, 1,406.99 and 577.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.57 : 1,406.99 = 577.55 : x
2. Step 2: Convert to fraction form
   1,019.57/1,406.99 = 577.55/x
3. Step 3: Cross multiply
   1,019.57x = 1,406.99 × 577.55
4. Step 4: Simplify right side
   1,019.57x = 812,612.04
5. Step 5: Solve for x
   x = 812,612.04/1,019.57
6. Step 6: Final answer
   x = 797.02