Finding the Fourth Proportional to 72,415.94, 99,928.52 and 40,578.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72,415.94 : 99,928.52 = 40,578.68 : x
2. Step 2: Convert to fraction form
   72,415.94/99,928.52 = 40,578.68/x
3. Step 3: Cross multiply
   72,415.94x = 99,928.52 × 40,578.68
4. Step 4: Simplify right side
   72,415.94x = 4,054,967,435.95
5. Step 5: Solve for x
   x = 4,054,967,435.95/72,415.94
6. Step 6: Final answer
   x = 55,995.51