Finding the Fourth Proportional to 8,501.34, 12,745.86 and 5,721.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,501.34 : 12,745.86 = 5,721.12 : x
2. Step 2: Convert to fraction form
   8,501.34/12,745.86 = 5,721.12/x
3. Step 3: Cross multiply
   8,501.34x = 12,745.86 × 5,721.12
4. Step 4: Simplify right side
   8,501.34x = 72,920,594.56
5. Step 5: Solve for x
   x = 72,920,594.56/8,501.34
6. Step 6: Final answer
   x = 8,577.54