Finding the Fourth Proportional to 1,019.51, 1,406.90 and 577.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.51 : 1,406.90 = 577.41 : x
2. Step 2: Convert to fraction form
   1,019.51/1,406.90 = 577.41/x
3. Step 3: Cross multiply
   1,019.51x = 1,406.90 × 577.41
4. Step 4: Simplify right side
   1,019.51x = 812,355.24
5. Step 5: Solve for x
   x = 812,355.24/1,019.51
6. Step 6: Final answer
   x = 796.81