Finding the Fourth Proportional to 72,009.54, 99,372.42 and 39,744.36

Step by Step Solution

1. Step 1: Write the proportion equation
   72,009.54 : 99,372.42 = 39,744.36 : x
2. Step 2: Convert to fraction form
   72,009.54/99,372.42 = 39,744.36/x
3. Step 3: Cross multiply
   72,009.54x = 99,372.42 × 39,744.36
4. Step 4: Simplify right side
   72,009.54x = 3,949,493,234.55
5. Step 5: Solve for x
   x = 3,949,493,234.55/72,009.54
6. Step 6: Final answer
   x = 54,846.81