Finding the Fourth Proportional to 12,880.52, 17,776.24 and 7,215.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,880.52 : 17,776.24 = 7,215.18 : x
2. Step 2: Convert to fraction form
   12,880.52/17,776.24 = 7,215.18/x
3. Step 3: Cross multiply
   12,880.52x = 17,776.24 × 7,215.18
4. Step 4: Simplify right side
   12,880.52x = 128,258,727.21
5. Step 5: Solve for x
   x = 128,258,727.21/12,880.52
6. Step 6: Final answer
   x = 9,957.57