Finding the Fourth Proportional to 12,728.68, 19,086.52 and 5,331.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,728.68 : 19,086.52 = 5,331.12 : x
2. Step 2: Convert to fraction form
   12,728.68/19,086.52 = 5,331.12/x
3. Step 3: Cross multiply
   12,728.68x = 19,086.52 × 5,331.12
4. Step 4: Simplify right side
   12,728.68x = 101,752,528.50
5. Step 5: Solve for x
   x = 101,752,528.50/12,728.68
6. Step 6: Final answer
   x = 7,993.96