Finding the Fourth Proportional to 72,278.28, 99,740.73 and 40,014.09

Step by Step Solution

1. Step 1: Write the proportion equation
   72,278.28 : 99,740.73 = 40,014.09 : x
2. Step 2: Convert to fraction form
   72,278.28/99,740.73 = 40,014.09/x
3. Step 3: Cross multiply
   72,278.28x = 99,740.73 × 40,014.09
4. Step 4: Simplify right side
   72,278.28x = 3,991,034,546.89
5. Step 5: Solve for x
   x = 3,991,034,546.89/72,278.28
6. Step 6: Final answer
   x = 55,217.62