Finding the Fourth Proportional to 67,424.82, 93,043.53 and 39,128.28

Step by Step Solution

1. Step 1: Write the proportion equation
   67,424.82 : 93,043.53 = 39,128.28 : x
2. Step 2: Convert to fraction form
   67,424.82/93,043.53 = 39,128.28/x
3. Step 3: Cross multiply
   67,424.82x = 93,043.53 × 39,128.28
4. Step 4: Simplify right side
   67,424.82x = 3,640,633,294.03
5. Step 5: Solve for x
   x = 3,640,633,294.03/67,424.82
6. Step 6: Final answer
   x = 53,995.45