Finding the Fourth Proportional to 8,520.32, 12,762.00 and 4,128.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,520.32 : 12,762.00 = 4,128.57 : x
2. Step 2: Convert to fraction form
   8,520.32/12,762.00 = 4,128.57/x
3. Step 3: Cross multiply
   8,520.32x = 12,762.00 × 4,128.57
4. Step 4: Simplify right side
   8,520.32x = 52,688,725.89
5. Step 5: Solve for x
   x = 52,688,725.89/8,520.32
6. Step 6: Final answer
   x = 6,183.89