Finding the Fourth Proportional to 8,511.31, 12,770.61 and 3,320.83

Step by Step Solution

1. Step 1: Write the proportion equation
   8,511.31 : 12,770.61 = 3,320.83 : x
2. Step 2: Convert to fraction form
   8,511.31/12,770.61 = 3,320.83/x
3. Step 3: Cross multiply
   8,511.31x = 12,770.61 × 3,320.83
4. Step 4: Simplify right side
   8,511.31x = 42,409,024.81
5. Step 5: Solve for x
   x = 42,409,024.81/8,511.31
6. Step 6: Final answer
   x = 4,982.67