Finding the Fourth Proportional to 30,644.76, 42,261.67 and 19,878.41

Step by Step Solution

1. Step 1: Write the proportion equation
   30,644.76 : 42,261.67 = 19,878.41 : x
2. Step 2: Convert to fraction form
   30,644.76/42,261.67 = 19,878.41/x
3. Step 3: Cross multiply
   30,644.76x = 42,261.67 × 19,878.41
4. Step 4: Simplify right side
   30,644.76x = 840,094,803.54
5. Step 5: Solve for x
   x = 840,094,803.54/30,644.76
6. Step 6: Final answer
   x = 27,413.98