Finding the Fourth Proportional to 8,648.64, 12,960.78 and 4,945.32

Step by Step Solution

1. Step 1: Write the proportion equation
   8,648.64 : 12,960.78 = 4,945.32 : x
2. Step 2: Convert to fraction form
   8,648.64/12,960.78 = 4,945.32/x
3. Step 3: Cross multiply
   8,648.64x = 12,960.78 × 4,945.32
4. Step 4: Simplify right side
   8,648.64x = 64,095,204.55
5. Step 5: Solve for x
   x = 64,095,204.55/8,648.64
6. Step 6: Final answer
   x = 7,411.02