Finding the Fourth Proportional to 30,728.09, 42,387.10 and 19,393.56

Step by Step Solution

1. Step 1: Write the proportion equation
   30,728.09 : 42,387.10 = 19,393.56 : x
2. Step 2: Convert to fraction form
   30,728.09/42,387.10 = 19,393.56/x
3. Step 3: Cross multiply
   30,728.09x = 42,387.10 × 19,393.56
4. Step 4: Simplify right side
   30,728.09x = 822,036,718.59
5. Step 5: Solve for x
   x = 822,036,718.59/30,728.09
6. Step 6: Final answer
   x = 26,751.96