Finding the Fourth Proportional to 72,144.78, 99,559.53 and 40,313.67

Step by Step Solution

1. Step 1: Write the proportion equation
   72,144.78 : 99,559.53 = 40,313.67 : x
2. Step 2: Convert to fraction form
   72,144.78/99,559.53 = 40,313.67/x
3. Step 3: Cross multiply
   72,144.78x = 99,559.53 × 40,313.67
4. Step 4: Simplify right side
   72,144.78x = 4,013,610,037.78
5. Step 5: Solve for x
   x = 4,013,610,037.78/72,144.78
6. Step 6: Final answer
   x = 55,632.72