Finding the Fourth Proportional to 72,289.67, 99,759.73 and 40,458.57

Step by Step Solution

1. Step 1: Write the proportion equation
   72,289.67 : 99,759.73 = 40,458.57 : x
2. Step 2: Convert to fraction form
   72,289.67/99,759.73 = 40,458.57/x
3. Step 3: Cross multiply
   72,289.67x = 99,759.73 × 40,458.57
4. Step 4: Simplify right side
   72,289.67x = 4,036,136,019.39
5. Step 5: Solve for x
   x = 4,036,136,019.39/72,289.67
6. Step 6: Final answer
   x = 55,832.82