Finding the Fourth Proportional to 72,158.59, 99,578.64 and 40,327.57

Step by Step Solution

1. Step 1: Write the proportion equation
   72,158.59 : 99,578.64 = 40,327.57 : x
2. Step 2: Convert to fraction form
   72,158.59/99,578.64 = 40,327.57/x
3. Step 3: Cross multiply
   72,158.59x = 99,578.64 × 40,327.57
4. Step 4: Simplify right side
   72,158.59x = 4,015,764,575.10
5. Step 5: Solve for x
   x = 4,015,764,575.10/72,158.59
6. Step 6: Final answer
   x = 55,651.93