Finding the Fourth Proportional to 72,005.81, 99,364.42 and 40,168.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72,005.81 : 99,364.42 = 40,168.56 : x
2. Step 2: Convert to fraction form
   72,005.81/99,364.42 = 40,168.56/x
3. Step 3: Cross multiply
   72,005.81x = 99,364.42 × 40,168.56
4. Step 4: Simplify right side
   72,005.81x = 3,991,325,530.54
5. Step 5: Solve for x
   x = 3,991,325,530.54/72,005.81
6. Step 6: Final answer
   x = 55,430.60