Finding the Fourth Proportional to 30,978.88, 42,728.96 and 19,048.96

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978.88 : 42,728.96 = 19,048.96 : x
2. Step 2: Convert to fraction form
   30,978.88/42,728.96 = 19,048.96/x
3. Step 3: Cross multiply
   30,978.88x = 42,728.96 × 19,048.96
4. Step 4: Simplify right side
   30,978.88x = 813,942,249.88
5. Step 5: Solve for x
   x = 813,942,249.88/30,978.88
6. Step 6: Final answer
   x = 26,274.10