Finding the Fourth Proportional to 12,896.54, 17,681.32 and 12,663.26

Step by Step Solution

1. Step 1: Write the proportion equation
   12,896.54 : 17,681.32 = 12,663.26 : x
2. Step 2: Convert to fraction form
   12,896.54/17,681.32 = 12,663.26/x
3. Step 3: Cross multiply
   12,896.54x = 17,681.32 × 12,663.26
4. Step 4: Simplify right side
   12,896.54x = 223,903,152.30
5. Step 5: Solve for x
   x = 223,903,152.30/12,896.54
6. Step 6: Final answer
   x = 17,361.49