Finding the Fourth Proportional to 30,538.89, 42,143.09 and 19,908.45

Step by Step Solution

1. Step 1: Write the proportion equation
   30,538.89 : 42,143.09 = 19,908.45 : x
2. Step 2: Convert to fraction form
   30,538.89/42,143.09 = 19,908.45/x
3. Step 3: Cross multiply
   30,538.89x = 42,143.09 × 19,908.45
4. Step 4: Simplify right side
   30,538.89x = 839,003,500.57
5. Step 5: Solve for x
   x = 839,003,500.57/30,538.89
6. Step 6: Final answer
   x = 27,473.28