Finding the Fourth Proportional to 30,901.38, 42,639.98 and 20,141.34

Step by Step Solution

1. Step 1: Write the proportion equation
   30,901.38 : 42,639.98 = 20,141.34 : x
2. Step 2: Convert to fraction form
   30,901.38/42,639.98 = 20,141.34/x
3. Step 3: Cross multiply
   30,901.38x = 42,639.98 × 20,141.34
4. Step 4: Simplify right side
   30,901.38x = 858,826,334.77
5. Step 5: Solve for x
   x = 858,826,334.77/30,901.38
6. Step 6: Final answer
   x = 27,792.49