Finding the Fourth Proportional to 50,815.57, 70,128.09 and 30,672.19

Step by Step Solution

1. Step 1: Write the proportion equation
   50,815.57 : 70,128.09 = 30,672.19 : x
2. Step 2: Convert to fraction form
   50,815.57/70,128.09 = 30,672.19/x
3. Step 3: Cross multiply
   50,815.57x = 70,128.09 × 30,672.19
4. Step 4: Simplify right side
   50,815.57x = 2,150,982,100.82
5. Step 5: Solve for x
   x = 2,150,982,100.82/50,815.57
6. Step 6: Final answer
   x = 42,329.19