Finding the Fourth Proportional to 72,072.86, 99,463.88 and 39,811.97

Step by Step Solution

1. Step 1: Write the proportion equation
   72,072.86 : 99,463.88 = 39,811.97 : x
2. Step 2: Convert to fraction form
   72,072.86/99,463.88 = 39,811.97/x
3. Step 3: Cross multiply
   72,072.86x = 99,463.88 × 39,811.97
4. Step 4: Simplify right side
   72,072.86x = 3,959,853,354.83
5. Step 5: Solve for x
   x = 3,959,853,354.83/72,072.86
6. Step 6: Final answer
   x = 54,942.37