Finding the Fourth Proportional to 8,763.82, 13,137.89 and 3,215.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,763.82 : 13,137.89 = 3,215.86 : x
2. Step 2: Convert to fraction form
   8,763.82/13,137.89 = 3,215.86/x
3. Step 3: Cross multiply
   8,763.82x = 13,137.89 × 3,215.86
4. Step 4: Simplify right side
   8,763.82x = 42,249,614.94
5. Step 5: Solve for x
   x = 42,249,614.94/8,763.82
6. Step 6: Final answer
   x = 4,820.91