Finding the Fourth Proportional to 12,728.23, 17,561.02 and 7,419.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,728.23 : 17,561.02 = 7,419.28 : x
2. Step 2: Convert to fraction form
   12,728.23/17,561.02 = 7,419.28/x
3. Step 3: Cross multiply
   12,728.23x = 17,561.02 × 7,419.28
4. Step 4: Simplify right side
   12,728.23x = 130,290,124.47
5. Step 5: Solve for x
   x = 130,290,124.47/12,728.23
6. Step 6: Final answer
   x = 10,236.31