Finding the Fourth Proportional to 8,764.92, 13,139.56 and 3,216.98

Step by Step Solution

1. Step 1: Write the proportion equation
   8,764.92 : 13,139.56 = 3,216.98 : x
2. Step 2: Convert to fraction form
   8,764.92/13,139.56 = 3,216.98/x
3. Step 3: Cross multiply
   8,764.92x = 13,139.56 × 3,216.98
4. Step 4: Simplify right side
   8,764.92x = 42,269,664.69
5. Step 5: Solve for x
   x = 42,269,664.69/8,764.92
6. Step 6: Final answer
   x = 4,822.60