Finding the Fourth Proportional to 72,439.92, 99,968.72 and 40,608

Step by Step Solution

1. Step 1: Write the proportion equation
   72,439.92 : 99,968.72 = 40,608 : x
2. Step 2: Convert to fraction form
   72,439.92/99,968.72 = 40,608/x
3. Step 3: Cross multiply
   72,439.92x = 99,968.72 × 40,608
4. Step 4: Simplify right side
   72,439.92x = 4,059,529,578.72
5. Step 5: Solve for x
   x = 4,059,529,578.72/72,439.92
6. Step 6: Final answer
   x = 56,039.95