Finding the Fourth Proportional to 8,764.78, 13,139.35 and 3,216.83

Step by Step Solution

1. Step 1: Write the proportion equation
   8,764.78 : 13,139.35 = 3,216.83 : x
2. Step 2: Convert to fraction form
   8,764.78/13,139.35 = 3,216.83/x
3. Step 3: Cross multiply
   8,764.78x = 13,139.35 × 3,216.83
4. Step 4: Simplify right side
   8,764.78x = 42,267,124.43
5. Step 5: Solve for x
   x = 42,267,124.43/8,764.78
6. Step 6: Final answer
   x = 4,822.38