Finding the Fourth Proportional to 30,768.15, 42,485.28 and 19,455.96

Step by Step Solution

1. Step 1: Write the proportion equation
   30,768.15 : 42,485.28 = 19,455.96 : x
2. Step 2: Convert to fraction form
   30,768.15/42,485.28 = 19,455.96/x
3. Step 3: Cross multiply
   30,768.15x = 42,485.28 × 19,455.96
4. Step 4: Simplify right side
   30,768.15x = 826,591,908.27
5. Step 5: Solve for x
   x = 826,591,908.27/30,768.15
6. Step 6: Final answer
   x = 26,865.18