Finding the Fourth Proportional to 72,391.96, 99,899.94 and 40,561.48

Step by Step Solution

1. Step 1: Write the proportion equation
   72,391.96 : 99,899.94 = 40,561.48 : x
2. Step 2: Convert to fraction form
   72,391.96/99,899.94 = 40,561.48/x
3. Step 3: Cross multiply
   72,391.96x = 99,899.94 × 40,561.48
4. Step 4: Simplify right side
   72,391.96x = 4,052,089,418.31
5. Step 5: Solve for x
   x = 4,052,089,418.31/72,391.96
6. Step 6: Final answer
   x = 55,974.30