Finding the Fourth Proportional to 72,185.94, 99,617.90 and 40,351.42

Step by Step Solution

1. Step 1: Write the proportion equation
   72,185.94 : 99,617.90 = 40,351.42 : x
2. Step 2: Convert to fraction form
   72,185.94/99,617.90 = 40,351.42/x
3. Step 3: Cross multiply
   72,185.94x = 99,617.90 × 40,351.42
4. Step 4: Simplify right side
   72,185.94x = 4,019,723,722.42
5. Step 5: Solve for x
   x = 4,019,723,722.42/72,185.94
6. Step 6: Final answer
   x = 55,685.69