Finding the Fourth Proportional to 30,755.98, 42,450.15 and 20,139.43

Step by Step Solution

1. Step 1: Write the proportion equation
   30,755.98 : 42,450.15 = 20,139.43 : x
2. Step 2: Convert to fraction form
   30,755.98/42,450.15 = 20,139.43/x
3. Step 3: Cross multiply
   30,755.98x = 42,450.15 × 20,139.43
4. Step 4: Simplify right side
   30,755.98x = 854,921,824.41
5. Step 5: Solve for x
   x = 854,921,824.41/30,755.98
6. Step 6: Final answer
   x = 27,796.93