Finding the Fourth Proportional to 12,896.04, 17,680.63 and 12,662.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,896.04 : 17,680.63 = 12,662.76 : x
2. Step 2: Convert to fraction form
   12,896.04/17,680.63 = 12,662.76/x
3. Step 3: Cross multiply
   12,896.04x = 17,680.63 × 12,662.76
4. Step 4: Simplify right side
   12,896.04x = 223,885,485.94
5. Step 5: Solve for x
   x = 223,885,485.94/12,896.04
6. Step 6: Final answer
   x = 17,360.80