Finding the Fourth Proportional to 12,129, 16,738.20 and 7,412.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,129 : 16,738.20 = 7,412.28 : x
2. Step 2: Convert to fraction form
   12,129/16,738.20 = 7,412.28/x
3. Step 3: Cross multiply
   12,129x = 16,738.20 × 7,412.28
4. Step 4: Simplify right side
   12,129x = 124,068,225.10
5. Step 5: Solve for x
   x = 124,068,225.10/12,129
6. Step 6: Final answer
   x = 10,229.06