Finding the Fourth Proportional to 7,111.80, 9,764.55 and 5,775.30

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.80 : 9,764.55 = 5,775.30 : x
2. Step 2: Convert to fraction form
   7,111.80/9,764.55 = 5,775.30/x
3. Step 3: Cross multiply
   7,111.80x = 9,764.55 × 5,775.30
4. Step 4: Simplify right side
   7,111.80x = 56,393,205.62
5. Step 5: Solve for x
   x = 56,393,205.62/7,111.80
6. Step 6: Final answer
   x = 7,929.53