Finding the Fourth Proportional to 8,520.42, 12,774.20 and 5,739.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,520.42 : 12,774.20 = 5,739.28 : x
2. Step 2: Convert to fraction form
   8,520.42/12,774.20 = 5,739.28/x
3. Step 3: Cross multiply
   8,520.42x = 12,774.20 × 5,739.28
4. Step 4: Simplify right side
   8,520.42x = 73,314,710.58
5. Step 5: Solve for x
   x = 73,314,710.58/8,520.42
6. Step 6: Final answer
   x = 8,604.59