Finding the Fourth Proportional to 39,839.58, 54,978.30 and 21,934.88

Step by Step Solution

1. Step 1: Write the proportion equation
   39,839.58 : 54,978.30 = 21,934.88 : x
2. Step 2: Convert to fraction form
   39,839.58/54,978.30 = 21,934.88/x
3. Step 3: Cross multiply
   39,839.58x = 54,978.30 × 21,934.88
4. Step 4: Simplify right side
   39,839.58x = 1,205,942,413.10
5. Step 5: Solve for x
   x = 1,205,942,413.10/39,839.58
6. Step 6: Final answer
   x = 30,269.96