Finding the Fourth Proportional to 72,355.97, 99,857.39 and 42,144.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,355.97 : 99,857.39 = 42,144.05 : x
2. Step 2: Convert to fraction form
   72,355.97/99,857.39 = 42,144.05/x
3. Step 3: Cross multiply
   72,355.97x = 99,857.39 × 42,144.05
4. Step 4: Simplify right side
   72,355.97x = 4,208,394,127.02
5. Step 5: Solve for x
   x = 4,208,394,127.02/72,355.97
6. Step 6: Final answer
   x = 58,162.37