Finding the Fourth Proportional to 72,221.29, 99,656.64 and 39,953.73

Step by Step Solution

1. Step 1: Write the proportion equation
   72,221.29 : 99,656.64 = 39,953.73 : x
2. Step 2: Convert to fraction form
   72,221.29/99,656.64 = 39,953.73/x
3. Step 3: Cross multiply
   72,221.29x = 99,656.64 × 39,953.73
4. Step 4: Simplify right side
   72,221.29x = 3,981,654,487.27
5. Step 5: Solve for x
   x = 3,981,654,487.27/72,221.29
6. Step 6: Final answer
   x = 55,131.31