Finding the Fourth Proportional to 8,520.08, 12,770.34 and 3,321.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,520.08 : 12,770.34 = 3,321.56 : x
2. Step 2: Convert to fraction form
   8,520.08/12,770.34 = 3,321.56/x
3. Step 3: Cross multiply
   8,520.08x = 12,770.34 × 3,321.56
4. Step 4: Simplify right side
   8,520.08x = 42,417,450.53
5. Step 5: Solve for x
   x = 42,417,450.53/8,520.08
6. Step 6: Final answer
   x = 4,978.53