Finding the Fourth Proportional to 12,128, 16,736.82 and 7,411.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,128 : 16,736.82 = 7,411.28 : x
2. Step 2: Convert to fraction form
   12,128/16,736.82 = 7,411.28/x
3. Step 3: Cross multiply
   12,128x = 16,736.82 × 7,411.28
4. Step 4: Simplify right side
   12,128x = 124,041,259.33
5. Step 5: Solve for x
   x = 124,041,259.33/12,128
6. Step 6: Final answer
   x = 10,227.68