Finding the Fourth Proportional to 72,215.89, 99,656.07 and 39,949.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72,215.89 : 99,656.07 = 39,949.68 : x
2. Step 2: Convert to fraction form
   72,215.89/99,656.07 = 39,949.68/x
3. Step 3: Cross multiply
   72,215.89x = 99,656.07 × 39,949.68
4. Step 4: Simplify right side
   72,215.89x = 3,981,227,583.04
5. Step 5: Solve for x
   x = 3,981,227,583.04/72,215.89
6. Step 6: Final answer
   x = 55,129.52