Finding the Fourth Proportional to 30,498.48, 42,054.48 and 19,868.40

Step by Step Solution

1. Step 1: Write the proportion equation
   30,498.48 : 42,054.48 = 19,868.40 : x
2. Step 2: Convert to fraction form
   30,498.48/42,054.48 = 19,868.40/x
3. Step 3: Cross multiply
   30,498.48x = 42,054.48 × 19,868.40
4. Step 4: Simplify right side
   30,498.48x = 835,555,230.43
5. Step 5: Solve for x
   x = 835,555,230.43/30,498.48
6. Step 6: Final answer
   x = 27,396.62