Finding the Fourth Proportional to 8,790.72, 12,131.28 and 4,811.73

Step by Step Solution

1. Step 1: Write the proportion equation
   8,790.72 : 12,131.28 = 4,811.73 : x
2. Step 2: Convert to fraction form
   8,790.72/12,131.28 = 4,811.73/x
3. Step 3: Cross multiply
   8,790.72x = 12,131.28 × 4,811.73
4. Step 4: Simplify right side
   8,790.72x = 58,372,443.91
5. Step 5: Solve for x
   x = 58,372,443.91/8,790.72
6. Step 6: Final answer
   x = 6,640.23