Finding the Fourth Proportional to 13,021.49, 17,926.21 and 12,426.45

Step by Step Solution

1. Step 1: Write the proportion equation
   13,021.49 : 17,926.21 = 12,426.45 : x
2. Step 2: Convert to fraction form
   13,021.49/17,926.21 = 12,426.45/x
3. Step 3: Cross multiply
   13,021.49x = 17,926.21 × 12,426.45
4. Step 4: Simplify right side
   13,021.49x = 222,759,100.56
5. Step 5: Solve for x
   x = 222,759,100.56/13,021.49
6. Step 6: Final answer
   x = 17,107.03