Finding the Fourth Proportional to 13,128.89, 19,673.89 and 10,805.41

Step by Step Solution

1. Step 1: Write the proportion equation
   13,128.89 : 19,673.89 = 10,805.41 : x
2. Step 2: Convert to fraction form
   13,128.89/19,673.89 = 10,805.41/x
3. Step 3: Cross multiply
   13,128.89x = 19,673.89 × 10,805.41
4. Step 4: Simplify right side
   13,128.89x = 212,584,371.55
5. Step 5: Solve for x
   x = 212,584,371.55/13,128.89
6. Step 6: Final answer
   x = 16,192.10