Finding the Fourth Proportional to 1,015.86, 1,401.84 and 573.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.86 : 1,401.84 = 573.80 : x
2. Step 2: Convert to fraction form
   1,015.86/1,401.84 = 573.80/x
3. Step 3: Cross multiply
   1,015.86x = 1,401.84 × 573.80
4. Step 4: Simplify right side
   1,015.86x = 804,368.78
5. Step 5: Solve for x
   x = 804,368.78/1,015.86
6. Step 6: Final answer
   x = 791.81