Finding the Fourth Proportional to 1,061.24, 1,591.02 and 540.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.24 : 1,591.02 = 540.77 : x
2. Step 2: Convert to fraction form
   1,061.24/1,591.02 = 540.77/x
3. Step 3: Cross multiply
   1,061.24x = 1,591.02 × 540.77
4. Step 4: Simplify right side
   1,061.24x = 860,367.93
5. Step 5: Solve for x
   x = 860,367.93/1,061.24
6. Step 6: Final answer
   x = 810.72